1 /* DWARF 2 debugging format support for GDB.
3 Copyright (C) 1994-2013 Free Software Foundation, Inc.
5 Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology,
6 Inc. with support from Florida State University (under contract
7 with the Ada Joint Program Office), and Silicon Graphics, Inc.
8 Initial contribution by Brent Benson, Harris Computer Systems, Inc.,
9 based on Fred Fish's (Cygnus Support) implementation of DWARF 1
12 This file is part of GDB.
14 This program is free software; you can redistribute it and/or modify
15 it under the terms of the GNU General Public License as published by
16 the Free Software Foundation; either version 3 of the License, or
17 (at your option) any later version.
19 This program is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 GNU General Public License for more details.
24 You should have received a copy of the GNU General Public License
25 along with this program. If not, see <http://www.gnu.org/licenses/>. */
27 /* FIXME: Various die-reading functions need to be more careful with
28 reading off the end of the section.
29 E.g., load_partial_dies, read_partial_die. */
40 #include "gdb-demangle.h"
41 #include "expression.h"
42 #include "filenames.h" /* for DOSish file names */
45 #include "complaints.h"
47 #include "dwarf2expr.h"
48 #include "dwarf2loc.h"
49 #include "cp-support.h"
55 #include "typeprint.h"
58 #include "exceptions.h"
60 #include "completer.h"
65 #include "gdbcore.h" /* for gnutarget */
66 #include "gdb/gdb-index.h"
71 #include "filestuff.h"
74 #include "gdb_string.h"
75 #include "gdb_assert.h"
76 #include <sys/types.h>
78 typedef struct symbol *symbolp;
81 /* When non-zero, print basic high level tracing messages.
82 This is in contrast to the low level DIE reading of dwarf2_die_debug. */
83 static int dwarf2_read_debug = 0;
85 /* When non-zero, dump DIEs after they are read in. */
86 static unsigned int dwarf2_die_debug = 0;
88 /* When non-zero, cross-check physname against demangler. */
89 static int check_physname = 0;
91 /* When non-zero, do not reject deprecated .gdb_index sections. */
92 static int use_deprecated_index_sections = 0;
94 static const struct objfile_data *dwarf2_objfile_data_key;
96 /* The "aclass" indices for various kinds of computed DWARF symbols. */
98 static int dwarf2_locexpr_index;
99 static int dwarf2_loclist_index;
100 static int dwarf2_locexpr_block_index;
101 static int dwarf2_loclist_block_index;
103 struct dwarf2_section_info
106 const gdb_byte *buffer;
108 /* True if we have tried to read this section. */
112 typedef struct dwarf2_section_info dwarf2_section_info_def;
113 DEF_VEC_O (dwarf2_section_info_def);
115 /* All offsets in the index are of this type. It must be
116 architecture-independent. */
117 typedef uint32_t offset_type;
119 DEF_VEC_I (offset_type);
121 /* Ensure only legit values are used. */
122 #define DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE(cu_index, value) \
124 gdb_assert ((unsigned int) (value) <= 1); \
125 GDB_INDEX_SYMBOL_STATIC_SET_VALUE((cu_index), (value)); \
128 /* Ensure only legit values are used. */
129 #define DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE(cu_index, value) \
131 gdb_assert ((value) >= GDB_INDEX_SYMBOL_KIND_TYPE \
132 && (value) <= GDB_INDEX_SYMBOL_KIND_OTHER); \
133 GDB_INDEX_SYMBOL_KIND_SET_VALUE((cu_index), (value)); \
136 /* Ensure we don't use more than the alloted nuber of bits for the CU. */
137 #define DW2_GDB_INDEX_CU_SET_VALUE(cu_index, value) \
139 gdb_assert (((value) & ~GDB_INDEX_CU_MASK) == 0); \
140 GDB_INDEX_CU_SET_VALUE((cu_index), (value)); \
143 /* A description of the mapped index. The file format is described in
144 a comment by the code that writes the index. */
147 /* Index data format version. */
150 /* The total length of the buffer. */
153 /* A pointer to the address table data. */
154 const gdb_byte *address_table;
156 /* Size of the address table data in bytes. */
157 offset_type address_table_size;
159 /* The symbol table, implemented as a hash table. */
160 const offset_type *symbol_table;
162 /* Size in slots, each slot is 2 offset_types. */
163 offset_type symbol_table_slots;
165 /* A pointer to the constant pool. */
166 const char *constant_pool;
169 typedef struct dwarf2_per_cu_data *dwarf2_per_cu_ptr;
170 DEF_VEC_P (dwarf2_per_cu_ptr);
172 /* Collection of data recorded per objfile.
173 This hangs off of dwarf2_objfile_data_key. */
175 struct dwarf2_per_objfile
177 struct dwarf2_section_info info;
178 struct dwarf2_section_info abbrev;
179 struct dwarf2_section_info line;
180 struct dwarf2_section_info loc;
181 struct dwarf2_section_info macinfo;
182 struct dwarf2_section_info macro;
183 struct dwarf2_section_info str;
184 struct dwarf2_section_info ranges;
185 struct dwarf2_section_info addr;
186 struct dwarf2_section_info frame;
187 struct dwarf2_section_info eh_frame;
188 struct dwarf2_section_info gdb_index;
190 VEC (dwarf2_section_info_def) *types;
193 struct objfile *objfile;
195 /* Table of all the compilation units. This is used to locate
196 the target compilation unit of a particular reference. */
197 struct dwarf2_per_cu_data **all_comp_units;
199 /* The number of compilation units in ALL_COMP_UNITS. */
202 /* The number of .debug_types-related CUs. */
205 /* The .debug_types-related CUs (TUs).
206 This is stored in malloc space because we may realloc it. */
207 struct signatured_type **all_type_units;
209 /* The number of entries in all_type_unit_groups. */
210 int n_type_unit_groups;
212 /* Table of type unit groups.
213 This exists to make it easy to iterate over all CUs and TU groups. */
214 struct type_unit_group **all_type_unit_groups;
216 /* Table of struct type_unit_group objects.
217 The hash key is the DW_AT_stmt_list value. */
218 htab_t type_unit_groups;
220 /* A table mapping .debug_types signatures to its signatured_type entry.
221 This is NULL if the .debug_types section hasn't been read in yet. */
222 htab_t signatured_types;
224 /* Type unit statistics, to see how well the scaling improvements
228 int nr_uniq_abbrev_tables;
230 int nr_symtab_sharers;
231 int nr_stmt_less_type_units;
234 /* A chain of compilation units that are currently read in, so that
235 they can be freed later. */
236 struct dwarf2_per_cu_data *read_in_chain;
238 /* A table mapping DW_AT_dwo_name values to struct dwo_file objects.
239 This is NULL if the table hasn't been allocated yet. */
242 /* Non-zero if we've check for whether there is a DWP file. */
245 /* The DWP file if there is one, or NULL. */
246 struct dwp_file *dwp_file;
248 /* The shared '.dwz' file, if one exists. This is used when the
249 original data was compressed using 'dwz -m'. */
250 struct dwz_file *dwz_file;
252 /* A flag indicating wether this objfile has a section loaded at a
254 int has_section_at_zero;
256 /* True if we are using the mapped index,
257 or we are faking it for OBJF_READNOW's sake. */
258 unsigned char using_index;
260 /* The mapped index, or NULL if .gdb_index is missing or not being used. */
261 struct mapped_index *index_table;
263 /* When using index_table, this keeps track of all quick_file_names entries.
264 TUs typically share line table entries with a CU, so we maintain a
265 separate table of all line table entries to support the sharing.
266 Note that while there can be way more TUs than CUs, we've already
267 sorted all the TUs into "type unit groups", grouped by their
268 DW_AT_stmt_list value. Therefore the only sharing done here is with a
269 CU and its associated TU group if there is one. */
270 htab_t quick_file_names_table;
272 /* Set during partial symbol reading, to prevent queueing of full
274 int reading_partial_symbols;
276 /* Table mapping type DIEs to their struct type *.
277 This is NULL if not allocated yet.
278 The mapping is done via (CU/TU + DIE offset) -> type. */
279 htab_t die_type_hash;
281 /* The CUs we recently read. */
282 VEC (dwarf2_per_cu_ptr) *just_read_cus;
285 static struct dwarf2_per_objfile *dwarf2_per_objfile;
287 /* Default names of the debugging sections. */
289 /* Note that if the debugging section has been compressed, it might
290 have a name like .zdebug_info. */
292 static const struct dwarf2_debug_sections dwarf2_elf_names =
294 { ".debug_info", ".zdebug_info" },
295 { ".debug_abbrev", ".zdebug_abbrev" },
296 { ".debug_line", ".zdebug_line" },
297 { ".debug_loc", ".zdebug_loc" },
298 { ".debug_macinfo", ".zdebug_macinfo" },
299 { ".debug_macro", ".zdebug_macro" },
300 { ".debug_str", ".zdebug_str" },
301 { ".debug_ranges", ".zdebug_ranges" },
302 { ".debug_types", ".zdebug_types" },
303 { ".debug_addr", ".zdebug_addr" },
304 { ".debug_frame", ".zdebug_frame" },
305 { ".eh_frame", NULL },
306 { ".gdb_index", ".zgdb_index" },
310 /* List of DWO/DWP sections. */
312 static const struct dwop_section_names
314 struct dwarf2_section_names abbrev_dwo;
315 struct dwarf2_section_names info_dwo;
316 struct dwarf2_section_names line_dwo;
317 struct dwarf2_section_names loc_dwo;
318 struct dwarf2_section_names macinfo_dwo;
319 struct dwarf2_section_names macro_dwo;
320 struct dwarf2_section_names str_dwo;
321 struct dwarf2_section_names str_offsets_dwo;
322 struct dwarf2_section_names types_dwo;
323 struct dwarf2_section_names cu_index;
324 struct dwarf2_section_names tu_index;
328 { ".debug_abbrev.dwo", ".zdebug_abbrev.dwo" },
329 { ".debug_info.dwo", ".zdebug_info.dwo" },
330 { ".debug_line.dwo", ".zdebug_line.dwo" },
331 { ".debug_loc.dwo", ".zdebug_loc.dwo" },
332 { ".debug_macinfo.dwo", ".zdebug_macinfo.dwo" },
333 { ".debug_macro.dwo", ".zdebug_macro.dwo" },
334 { ".debug_str.dwo", ".zdebug_str.dwo" },
335 { ".debug_str_offsets.dwo", ".zdebug_str_offsets.dwo" },
336 { ".debug_types.dwo", ".zdebug_types.dwo" },
337 { ".debug_cu_index", ".zdebug_cu_index" },
338 { ".debug_tu_index", ".zdebug_tu_index" },
341 /* local data types */
343 /* The data in a compilation unit header, after target2host
344 translation, looks like this. */
345 struct comp_unit_head
349 unsigned char addr_size;
350 unsigned char signed_addr_p;
351 sect_offset abbrev_offset;
353 /* Size of file offsets; either 4 or 8. */
354 unsigned int offset_size;
356 /* Size of the length field; either 4 or 12. */
357 unsigned int initial_length_size;
359 /* Offset to the first byte of this compilation unit header in the
360 .debug_info section, for resolving relative reference dies. */
363 /* Offset to first die in this cu from the start of the cu.
364 This will be the first byte following the compilation unit header. */
365 cu_offset first_die_offset;
368 /* Type used for delaying computation of method physnames.
369 See comments for compute_delayed_physnames. */
370 struct delayed_method_info
372 /* The type to which the method is attached, i.e., its parent class. */
375 /* The index of the method in the type's function fieldlists. */
378 /* The index of the method in the fieldlist. */
381 /* The name of the DIE. */
384 /* The DIE associated with this method. */
385 struct die_info *die;
388 typedef struct delayed_method_info delayed_method_info;
389 DEF_VEC_O (delayed_method_info);
391 /* Internal state when decoding a particular compilation unit. */
394 /* The objfile containing this compilation unit. */
395 struct objfile *objfile;
397 /* The header of the compilation unit. */
398 struct comp_unit_head header;
400 /* Base address of this compilation unit. */
401 CORE_ADDR base_address;
403 /* Non-zero if base_address has been set. */
406 /* The language we are debugging. */
407 enum language language;
408 const struct language_defn *language_defn;
410 const char *producer;
412 /* The generic symbol table building routines have separate lists for
413 file scope symbols and all all other scopes (local scopes). So
414 we need to select the right one to pass to add_symbol_to_list().
415 We do it by keeping a pointer to the correct list in list_in_scope.
417 FIXME: The original dwarf code just treated the file scope as the
418 first local scope, and all other local scopes as nested local
419 scopes, and worked fine. Check to see if we really need to
420 distinguish these in buildsym.c. */
421 struct pending **list_in_scope;
423 /* The abbrev table for this CU.
424 Normally this points to the abbrev table in the objfile.
425 But if DWO_UNIT is non-NULL this is the abbrev table in the DWO file. */
426 struct abbrev_table *abbrev_table;
428 /* Hash table holding all the loaded partial DIEs
429 with partial_die->offset.SECT_OFF as hash. */
432 /* Storage for things with the same lifetime as this read-in compilation
433 unit, including partial DIEs. */
434 struct obstack comp_unit_obstack;
436 /* When multiple dwarf2_cu structures are living in memory, this field
437 chains them all together, so that they can be released efficiently.
438 We will probably also want a generation counter so that most-recently-used
439 compilation units are cached... */
440 struct dwarf2_per_cu_data *read_in_chain;
442 /* Backlink to our per_cu entry. */
443 struct dwarf2_per_cu_data *per_cu;
445 /* How many compilation units ago was this CU last referenced? */
448 /* A hash table of DIE cu_offset for following references with
449 die_info->offset.sect_off as hash. */
452 /* Full DIEs if read in. */
453 struct die_info *dies;
455 /* A set of pointers to dwarf2_per_cu_data objects for compilation
456 units referenced by this one. Only set during full symbol processing;
457 partial symbol tables do not have dependencies. */
460 /* Header data from the line table, during full symbol processing. */
461 struct line_header *line_header;
463 /* A list of methods which need to have physnames computed
464 after all type information has been read. */
465 VEC (delayed_method_info) *method_list;
467 /* To be copied to symtab->call_site_htab. */
468 htab_t call_site_htab;
470 /* Non-NULL if this CU came from a DWO file.
471 There is an invariant here that is important to remember:
472 Except for attributes copied from the top level DIE in the "main"
473 (or "stub") file in preparation for reading the DWO file
474 (e.g., DW_AT_GNU_addr_base), we KISS: there is only *one* CU.
475 Either there isn't a DWO file (in which case this is NULL and the point
476 is moot), or there is and either we're not going to read it (in which
477 case this is NULL) or there is and we are reading it (in which case this
479 struct dwo_unit *dwo_unit;
481 /* The DW_AT_addr_base attribute if present, zero otherwise
482 (zero is a valid value though).
483 Note this value comes from the stub CU/TU's DIE. */
486 /* The DW_AT_ranges_base attribute if present, zero otherwise
487 (zero is a valid value though).
488 Note this value comes from the stub CU/TU's DIE.
489 Also note that the value is zero in the non-DWO case so this value can
490 be used without needing to know whether DWO files are in use or not.
491 N.B. This does not apply to DW_AT_ranges appearing in
492 DW_TAG_compile_unit dies. This is a bit of a wart, consider if ever
493 DW_AT_ranges appeared in the DW_TAG_compile_unit of DWO DIEs: then
494 DW_AT_ranges_base *would* have to be applied, and we'd have to care
495 whether the DW_AT_ranges attribute came from the skeleton or DWO. */
496 ULONGEST ranges_base;
498 /* Mark used when releasing cached dies. */
499 unsigned int mark : 1;
501 /* This CU references .debug_loc. See the symtab->locations_valid field.
502 This test is imperfect as there may exist optimized debug code not using
503 any location list and still facing inlining issues if handled as
504 unoptimized code. For a future better test see GCC PR other/32998. */
505 unsigned int has_loclist : 1;
507 /* These cache the results for producer_is_* fields. CHECKED_PRODUCER is set
508 if all the producer_is_* fields are valid. This information is cached
509 because profiling CU expansion showed excessive time spent in
510 producer_is_gxx_lt_4_6. */
511 unsigned int checked_producer : 1;
512 unsigned int producer_is_gxx_lt_4_6 : 1;
513 unsigned int producer_is_gcc_lt_4_3 : 1;
514 unsigned int producer_is_icc : 1;
516 /* When set, the file that we're processing is known to have
517 debugging info for C++ namespaces. GCC 3.3.x did not produce
518 this information, but later versions do. */
520 unsigned int processing_has_namespace_info : 1;
523 /* Persistent data held for a compilation unit, even when not
524 processing it. We put a pointer to this structure in the
525 read_symtab_private field of the psymtab. */
527 struct dwarf2_per_cu_data
529 /* The start offset and length of this compilation unit.
530 NOTE: Unlike comp_unit_head.length, this length includes
532 If the DIE refers to a DWO file, this is always of the original die,
537 /* Flag indicating this compilation unit will be read in before
538 any of the current compilation units are processed. */
539 unsigned int queued : 1;
541 /* This flag will be set when reading partial DIEs if we need to load
542 absolutely all DIEs for this compilation unit, instead of just the ones
543 we think are interesting. It gets set if we look for a DIE in the
544 hash table and don't find it. */
545 unsigned int load_all_dies : 1;
547 /* Non-zero if this CU is from .debug_types.
548 Struct dwarf2_per_cu_data is contained in struct signatured_type iff
550 unsigned int is_debug_types : 1;
552 /* Non-zero if this CU is from the .dwz file. */
553 unsigned int is_dwz : 1;
555 /* Non-zero if reading a TU directly from a DWO file, bypassing the stub.
556 This flag is only valid if is_debug_types is true.
557 We can't read a CU directly from a DWO file: There are required
558 attributes in the stub. */
559 unsigned int reading_dwo_directly : 1;
561 /* Non-zero if the TU has been read.
562 This is used to assist the "Stay in DWO Optimization" for Fission:
563 When reading a DWO, it's faster to read TUs from the DWO instead of
564 fetching them from random other DWOs (due to comdat folding).
565 If the TU has already been read, the optimization is unnecessary
566 (and unwise - we don't want to change where gdb thinks the TU lives
568 This flag is only valid if is_debug_types is true. */
569 unsigned int tu_read : 1;
571 /* The section this CU/TU lives in.
572 If the DIE refers to a DWO file, this is always the original die,
574 struct dwarf2_section_info *section;
576 /* Set to non-NULL iff this CU is currently loaded. When it gets freed out
577 of the CU cache it gets reset to NULL again. */
578 struct dwarf2_cu *cu;
580 /* The corresponding objfile.
581 Normally we can get the objfile from dwarf2_per_objfile.
582 However we can enter this file with just a "per_cu" handle. */
583 struct objfile *objfile;
585 /* When using partial symbol tables, the 'psymtab' field is active.
586 Otherwise the 'quick' field is active. */
589 /* The partial symbol table associated with this compilation unit,
590 or NULL for unread partial units. */
591 struct partial_symtab *psymtab;
593 /* Data needed by the "quick" functions. */
594 struct dwarf2_per_cu_quick_data *quick;
597 /* The CUs we import using DW_TAG_imported_unit. This is filled in
598 while reading psymtabs, used to compute the psymtab dependencies,
599 and then cleared. Then it is filled in again while reading full
600 symbols, and only deleted when the objfile is destroyed.
602 This is also used to work around a difference between the way gold
603 generates .gdb_index version <=7 and the way gdb does. Arguably this
604 is a gold bug. For symbols coming from TUs, gold records in the index
605 the CU that includes the TU instead of the TU itself. This breaks
606 dw2_lookup_symbol: It assumes that if the index says symbol X lives
607 in CU/TU Y, then one need only expand Y and a subsequent lookup in Y
608 will find X. Alas TUs live in their own symtab, so after expanding CU Y
609 we need to look in TU Z to find X. Fortunately, this is akin to
610 DW_TAG_imported_unit, so we just use the same mechanism: For
611 .gdb_index version <=7 this also records the TUs that the CU referred
612 to. Concurrently with this change gdb was modified to emit version 8
613 indices so we only pay a price for gold generated indices.
614 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
615 VEC (dwarf2_per_cu_ptr) *imported_symtabs;
618 /* Entry in the signatured_types hash table. */
620 struct signatured_type
622 /* The "per_cu" object of this type.
623 This struct is used iff per_cu.is_debug_types.
624 N.B.: This is the first member so that it's easy to convert pointers
626 struct dwarf2_per_cu_data per_cu;
628 /* The type's signature. */
631 /* Offset in the TU of the type's DIE, as read from the TU header.
632 If this TU is a DWO stub and the definition lives in a DWO file
633 (specified by DW_AT_GNU_dwo_name), this value is unusable. */
634 cu_offset type_offset_in_tu;
636 /* Offset in the section of the type's DIE.
637 If the definition lives in a DWO file, this is the offset in the
638 .debug_types.dwo section.
639 The value is zero until the actual value is known.
640 Zero is otherwise not a valid section offset. */
641 sect_offset type_offset_in_section;
643 /* Type units are grouped by their DW_AT_stmt_list entry so that they
644 can share them. This points to the containing symtab. */
645 struct type_unit_group *type_unit_group;
648 The first time we encounter this type we fully read it in and install it
649 in the symbol tables. Subsequent times we only need the type. */
652 /* Containing DWO unit.
653 This field is valid iff per_cu.reading_dwo_directly. */
654 struct dwo_unit *dwo_unit;
657 typedef struct signatured_type *sig_type_ptr;
658 DEF_VEC_P (sig_type_ptr);
660 /* A struct that can be used as a hash key for tables based on DW_AT_stmt_list.
661 This includes type_unit_group and quick_file_names. */
663 struct stmt_list_hash
665 /* The DWO unit this table is from or NULL if there is none. */
666 struct dwo_unit *dwo_unit;
668 /* Offset in .debug_line or .debug_line.dwo. */
669 sect_offset line_offset;
672 /* Each element of dwarf2_per_objfile->type_unit_groups is a pointer to
673 an object of this type. */
675 struct type_unit_group
677 /* dwarf2read.c's main "handle" on a TU symtab.
678 To simplify things we create an artificial CU that "includes" all the
679 type units using this stmt_list so that the rest of the code still has
680 a "per_cu" handle on the symtab.
681 This PER_CU is recognized by having no section. */
682 #define IS_TYPE_UNIT_GROUP(per_cu) ((per_cu)->section == NULL)
683 struct dwarf2_per_cu_data per_cu;
685 /* The TUs that share this DW_AT_stmt_list entry.
686 This is added to while parsing type units to build partial symtabs,
687 and is deleted afterwards and not used again. */
688 VEC (sig_type_ptr) *tus;
690 /* The primary symtab.
691 Type units in a group needn't all be defined in the same source file,
692 so we create an essentially anonymous symtab as the primary symtab. */
693 struct symtab *primary_symtab;
695 /* The data used to construct the hash key. */
696 struct stmt_list_hash hash;
698 /* The number of symtabs from the line header.
699 The value here must match line_header.num_file_names. */
700 unsigned int num_symtabs;
702 /* The symbol tables for this TU (obtained from the files listed in
704 WARNING: The order of entries here must match the order of entries
705 in the line header. After the first TU using this type_unit_group, the
706 line header for the subsequent TUs is recreated from this. This is done
707 because we need to use the same symtabs for each TU using the same
708 DW_AT_stmt_list value. Also note that symtabs may be repeated here,
709 there's no guarantee the line header doesn't have duplicate entries. */
710 struct symtab **symtabs;
713 /* These sections are what may appear in a DWO file. */
717 struct dwarf2_section_info abbrev;
718 struct dwarf2_section_info line;
719 struct dwarf2_section_info loc;
720 struct dwarf2_section_info macinfo;
721 struct dwarf2_section_info macro;
722 struct dwarf2_section_info str;
723 struct dwarf2_section_info str_offsets;
724 /* In the case of a virtual DWO file, these two are unused. */
725 struct dwarf2_section_info info;
726 VEC (dwarf2_section_info_def) *types;
729 /* CUs/TUs in DWP/DWO files. */
733 /* Backlink to the containing struct dwo_file. */
734 struct dwo_file *dwo_file;
736 /* The "id" that distinguishes this CU/TU.
737 .debug_info calls this "dwo_id", .debug_types calls this "signature".
738 Since signatures came first, we stick with it for consistency. */
741 /* The section this CU/TU lives in, in the DWO file. */
742 struct dwarf2_section_info *section;
744 /* Same as dwarf2_per_cu_data:{offset,length} but for the DWO section. */
748 /* For types, offset in the type's DIE of the type defined by this TU. */
749 cu_offset type_offset_in_tu;
752 /* Data for one DWO file.
753 This includes virtual DWO files that have been packaged into a
758 /* The DW_AT_GNU_dwo_name attribute.
759 For virtual DWO files the name is constructed from the section offsets
760 of abbrev,line,loc,str_offsets so that we combine virtual DWO files
761 from related CU+TUs. */
762 const char *dwo_name;
764 /* The DW_AT_comp_dir attribute. */
765 const char *comp_dir;
767 /* The bfd, when the file is open. Otherwise this is NULL.
768 This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */
771 /* Section info for this file. */
772 struct dwo_sections sections;
774 /* The CU in the file.
775 We only support one because having more than one requires hacking the
776 dwo_name of each to match, which is highly unlikely to happen.
777 Doing this means all TUs can share comp_dir: We also assume that
778 DW_AT_comp_dir across all TUs in a DWO file will be identical. */
781 /* Table of TUs in the file.
782 Each element is a struct dwo_unit. */
786 /* These sections are what may appear in a DWP file. */
790 struct dwarf2_section_info str;
791 struct dwarf2_section_info cu_index;
792 struct dwarf2_section_info tu_index;
793 /* The .debug_info.dwo, .debug_types.dwo, and other sections are referenced
794 by section number. We don't need to record them here. */
797 /* These sections are what may appear in a virtual DWO file. */
799 struct virtual_dwo_sections
801 struct dwarf2_section_info abbrev;
802 struct dwarf2_section_info line;
803 struct dwarf2_section_info loc;
804 struct dwarf2_section_info macinfo;
805 struct dwarf2_section_info macro;
806 struct dwarf2_section_info str_offsets;
807 /* Each DWP hash table entry records one CU or one TU.
808 That is recorded here, and copied to dwo_unit.section. */
809 struct dwarf2_section_info info_or_types;
812 /* Contents of DWP hash tables. */
814 struct dwp_hash_table
816 uint32_t nr_units, nr_slots;
817 const gdb_byte *hash_table, *unit_table, *section_pool;
820 /* Data for one DWP file. */
824 /* Name of the file. */
830 /* Section info for this file. */
831 struct dwp_sections sections;
833 /* Table of CUs in the file. */
834 const struct dwp_hash_table *cus;
836 /* Table of TUs in the file. */
837 const struct dwp_hash_table *tus;
839 /* Table of loaded CUs/TUs. Each entry is a struct dwo_unit *. */
842 /* Table to map ELF section numbers to their sections. */
843 unsigned int num_sections;
844 asection **elf_sections;
847 /* This represents a '.dwz' file. */
851 /* A dwz file can only contain a few sections. */
852 struct dwarf2_section_info abbrev;
853 struct dwarf2_section_info info;
854 struct dwarf2_section_info str;
855 struct dwarf2_section_info line;
856 struct dwarf2_section_info macro;
857 struct dwarf2_section_info gdb_index;
863 /* Struct used to pass misc. parameters to read_die_and_children, et
864 al. which are used for both .debug_info and .debug_types dies.
865 All parameters here are unchanging for the life of the call. This
866 struct exists to abstract away the constant parameters of die reading. */
868 struct die_reader_specs
870 /* die_section->asection->owner. */
873 /* The CU of the DIE we are parsing. */
874 struct dwarf2_cu *cu;
876 /* Non-NULL if reading a DWO file (including one packaged into a DWP). */
877 struct dwo_file *dwo_file;
879 /* The section the die comes from.
880 This is either .debug_info or .debug_types, or the .dwo variants. */
881 struct dwarf2_section_info *die_section;
883 /* die_section->buffer. */
884 const gdb_byte *buffer;
886 /* The end of the buffer. */
887 const gdb_byte *buffer_end;
889 /* The value of the DW_AT_comp_dir attribute. */
890 const char *comp_dir;
893 /* Type of function passed to init_cutu_and_read_dies, et.al. */
894 typedef void (die_reader_func_ftype) (const struct die_reader_specs *reader,
895 const gdb_byte *info_ptr,
896 struct die_info *comp_unit_die,
900 /* The line number information for a compilation unit (found in the
901 .debug_line section) begins with a "statement program header",
902 which contains the following information. */
905 unsigned int total_length;
906 unsigned short version;
907 unsigned int header_length;
908 unsigned char minimum_instruction_length;
909 unsigned char maximum_ops_per_instruction;
910 unsigned char default_is_stmt;
912 unsigned char line_range;
913 unsigned char opcode_base;
915 /* standard_opcode_lengths[i] is the number of operands for the
916 standard opcode whose value is i. This means that
917 standard_opcode_lengths[0] is unused, and the last meaningful
918 element is standard_opcode_lengths[opcode_base - 1]. */
919 unsigned char *standard_opcode_lengths;
921 /* The include_directories table. NOTE! These strings are not
922 allocated with xmalloc; instead, they are pointers into
923 debug_line_buffer. If you try to free them, `free' will get
925 unsigned int num_include_dirs, include_dirs_size;
926 const char **include_dirs;
928 /* The file_names table. NOTE! These strings are not allocated
929 with xmalloc; instead, they are pointers into debug_line_buffer.
930 Don't try to free them directly. */
931 unsigned int num_file_names, file_names_size;
935 unsigned int dir_index;
936 unsigned int mod_time;
938 int included_p; /* Non-zero if referenced by the Line Number Program. */
939 struct symtab *symtab; /* The associated symbol table, if any. */
942 /* The start and end of the statement program following this
943 header. These point into dwarf2_per_objfile->line_buffer. */
944 const gdb_byte *statement_program_start, *statement_program_end;
947 /* When we construct a partial symbol table entry we only
948 need this much information. */
949 struct partial_die_info
951 /* Offset of this DIE. */
954 /* DWARF-2 tag for this DIE. */
955 ENUM_BITFIELD(dwarf_tag) tag : 16;
957 /* Assorted flags describing the data found in this DIE. */
958 unsigned int has_children : 1;
959 unsigned int is_external : 1;
960 unsigned int is_declaration : 1;
961 unsigned int has_type : 1;
962 unsigned int has_specification : 1;
963 unsigned int has_pc_info : 1;
964 unsigned int may_be_inlined : 1;
966 /* Flag set if the SCOPE field of this structure has been
968 unsigned int scope_set : 1;
970 /* Flag set if the DIE has a byte_size attribute. */
971 unsigned int has_byte_size : 1;
973 /* Flag set if any of the DIE's children are template arguments. */
974 unsigned int has_template_arguments : 1;
976 /* Flag set if fixup_partial_die has been called on this die. */
977 unsigned int fixup_called : 1;
979 /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */
980 unsigned int is_dwz : 1;
982 /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */
983 unsigned int spec_is_dwz : 1;
985 /* The name of this DIE. Normally the value of DW_AT_name, but
986 sometimes a default name for unnamed DIEs. */
989 /* The linkage name, if present. */
990 const char *linkage_name;
992 /* The scope to prepend to our children. This is generally
993 allocated on the comp_unit_obstack, so will disappear
994 when this compilation unit leaves the cache. */
997 /* Some data associated with the partial DIE. The tag determines
998 which field is live. */
1001 /* The location description associated with this DIE, if any. */
1002 struct dwarf_block *locdesc;
1003 /* The offset of an import, for DW_TAG_imported_unit. */
1007 /* If HAS_PC_INFO, the PC range associated with this DIE. */
1011 /* Pointer into the info_buffer (or types_buffer) pointing at the target of
1012 DW_AT_sibling, if any. */
1013 /* NOTE: This member isn't strictly necessary, read_partial_die could
1014 return DW_AT_sibling values to its caller load_partial_dies. */
1015 const gdb_byte *sibling;
1017 /* If HAS_SPECIFICATION, the offset of the DIE referred to by
1018 DW_AT_specification (or DW_AT_abstract_origin or
1019 DW_AT_extension). */
1020 sect_offset spec_offset;
1022 /* Pointers to this DIE's parent, first child, and next sibling,
1024 struct partial_die_info *die_parent, *die_child, *die_sibling;
1027 /* This data structure holds the information of an abbrev. */
1030 unsigned int number; /* number identifying abbrev */
1031 enum dwarf_tag tag; /* dwarf tag */
1032 unsigned short has_children; /* boolean */
1033 unsigned short num_attrs; /* number of attributes */
1034 struct attr_abbrev *attrs; /* an array of attribute descriptions */
1035 struct abbrev_info *next; /* next in chain */
1040 ENUM_BITFIELD(dwarf_attribute) name : 16;
1041 ENUM_BITFIELD(dwarf_form) form : 16;
1044 /* Size of abbrev_table.abbrev_hash_table. */
1045 #define ABBREV_HASH_SIZE 121
1047 /* Top level data structure to contain an abbreviation table. */
1051 /* Where the abbrev table came from.
1052 This is used as a sanity check when the table is used. */
1055 /* Storage for the abbrev table. */
1056 struct obstack abbrev_obstack;
1058 /* Hash table of abbrevs.
1059 This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack.
1060 It could be statically allocated, but the previous code didn't so we
1062 struct abbrev_info **abbrevs;
1065 /* Attributes have a name and a value. */
1068 ENUM_BITFIELD(dwarf_attribute) name : 16;
1069 ENUM_BITFIELD(dwarf_form) form : 15;
1071 /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This
1072 field should be in u.str (existing only for DW_STRING) but it is kept
1073 here for better struct attribute alignment. */
1074 unsigned int string_is_canonical : 1;
1079 struct dwarf_block *blk;
1088 /* This data structure holds a complete die structure. */
1091 /* DWARF-2 tag for this DIE. */
1092 ENUM_BITFIELD(dwarf_tag) tag : 16;
1094 /* Number of attributes */
1095 unsigned char num_attrs;
1097 /* True if we're presently building the full type name for the
1098 type derived from this DIE. */
1099 unsigned char building_fullname : 1;
1102 unsigned int abbrev;
1104 /* Offset in .debug_info or .debug_types section. */
1107 /* The dies in a compilation unit form an n-ary tree. PARENT
1108 points to this die's parent; CHILD points to the first child of
1109 this node; and all the children of a given node are chained
1110 together via their SIBLING fields. */
1111 struct die_info *child; /* Its first child, if any. */
1112 struct die_info *sibling; /* Its next sibling, if any. */
1113 struct die_info *parent; /* Its parent, if any. */
1115 /* An array of attributes, with NUM_ATTRS elements. There may be
1116 zero, but it's not common and zero-sized arrays are not
1117 sufficiently portable C. */
1118 struct attribute attrs[1];
1121 /* Get at parts of an attribute structure. */
1123 #define DW_STRING(attr) ((attr)->u.str)
1124 #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical)
1125 #define DW_UNSND(attr) ((attr)->u.unsnd)
1126 #define DW_BLOCK(attr) ((attr)->u.blk)
1127 #define DW_SND(attr) ((attr)->u.snd)
1128 #define DW_ADDR(attr) ((attr)->u.addr)
1129 #define DW_SIGNATURE(attr) ((attr)->u.signature)
1131 /* Blocks are a bunch of untyped bytes. */
1136 /* Valid only if SIZE is not zero. */
1137 const gdb_byte *data;
1140 #ifndef ATTR_ALLOC_CHUNK
1141 #define ATTR_ALLOC_CHUNK 4
1144 /* Allocate fields for structs, unions and enums in this size. */
1145 #ifndef DW_FIELD_ALLOC_CHUNK
1146 #define DW_FIELD_ALLOC_CHUNK 4
1149 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte,
1150 but this would require a corresponding change in unpack_field_as_long
1152 static int bits_per_byte = 8;
1154 /* The routines that read and process dies for a C struct or C++ class
1155 pass lists of data member fields and lists of member function fields
1156 in an instance of a field_info structure, as defined below. */
1159 /* List of data member and baseclasses fields. */
1162 struct nextfield *next;
1167 *fields, *baseclasses;
1169 /* Number of fields (including baseclasses). */
1172 /* Number of baseclasses. */
1175 /* Set if the accesibility of one of the fields is not public. */
1176 int non_public_fields;
1178 /* Member function fields array, entries are allocated in the order they
1179 are encountered in the object file. */
1182 struct nextfnfield *next;
1183 struct fn_field fnfield;
1187 /* Member function fieldlist array, contains name of possibly overloaded
1188 member function, number of overloaded member functions and a pointer
1189 to the head of the member function field chain. */
1194 struct nextfnfield *head;
1198 /* Number of entries in the fnfieldlists array. */
1201 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of
1202 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */
1203 struct typedef_field_list
1205 struct typedef_field field;
1206 struct typedef_field_list *next;
1208 *typedef_field_list;
1209 unsigned typedef_field_list_count;
1212 /* One item on the queue of compilation units to read in full symbols
1214 struct dwarf2_queue_item
1216 struct dwarf2_per_cu_data *per_cu;
1217 enum language pretend_language;
1218 struct dwarf2_queue_item *next;
1221 /* The current queue. */
1222 static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail;
1224 /* Loaded secondary compilation units are kept in memory until they
1225 have not been referenced for the processing of this many
1226 compilation units. Set this to zero to disable caching. Cache
1227 sizes of up to at least twenty will improve startup time for
1228 typical inter-CU-reference binaries, at an obvious memory cost. */
1229 static int dwarf2_max_cache_age = 5;
1231 show_dwarf2_max_cache_age (struct ui_file *file, int from_tty,
1232 struct cmd_list_element *c, const char *value)
1234 fprintf_filtered (file, _("The upper bound on the age of cached "
1235 "dwarf2 compilation units is %s.\n"),
1239 /* local function prototypes */
1241 static void dwarf2_locate_sections (bfd *, asection *, void *);
1243 static void dwarf2_find_base_address (struct die_info *die,
1244 struct dwarf2_cu *cu);
1246 static struct partial_symtab *create_partial_symtab
1247 (struct dwarf2_per_cu_data *per_cu, const char *name);
1249 static void dwarf2_build_psymtabs_hard (struct objfile *);
1251 static void scan_partial_symbols (struct partial_die_info *,
1252 CORE_ADDR *, CORE_ADDR *,
1253 int, struct dwarf2_cu *);
1255 static void add_partial_symbol (struct partial_die_info *,
1256 struct dwarf2_cu *);
1258 static void add_partial_namespace (struct partial_die_info *pdi,
1259 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1260 int need_pc, struct dwarf2_cu *cu);
1262 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
1263 CORE_ADDR *highpc, int need_pc,
1264 struct dwarf2_cu *cu);
1266 static void add_partial_enumeration (struct partial_die_info *enum_pdi,
1267 struct dwarf2_cu *cu);
1269 static void add_partial_subprogram (struct partial_die_info *pdi,
1270 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1271 int need_pc, struct dwarf2_cu *cu);
1273 static void dwarf2_read_symtab (struct partial_symtab *,
1276 static void psymtab_to_symtab_1 (struct partial_symtab *);
1278 static struct abbrev_info *abbrev_table_lookup_abbrev
1279 (const struct abbrev_table *, unsigned int);
1281 static struct abbrev_table *abbrev_table_read_table
1282 (struct dwarf2_section_info *, sect_offset);
1284 static void abbrev_table_free (struct abbrev_table *);
1286 static void abbrev_table_free_cleanup (void *);
1288 static void dwarf2_read_abbrevs (struct dwarf2_cu *,
1289 struct dwarf2_section_info *);
1291 static void dwarf2_free_abbrev_table (void *);
1293 static unsigned int peek_abbrev_code (bfd *, const gdb_byte *);
1295 static struct partial_die_info *load_partial_dies
1296 (const struct die_reader_specs *, const gdb_byte *, int);
1298 static const gdb_byte *read_partial_die (const struct die_reader_specs *,
1299 struct partial_die_info *,
1300 struct abbrev_info *,
1304 static struct partial_die_info *find_partial_die (sect_offset, int,
1305 struct dwarf2_cu *);
1307 static void fixup_partial_die (struct partial_die_info *,
1308 struct dwarf2_cu *);
1310 static const gdb_byte *read_attribute (const struct die_reader_specs *,
1311 struct attribute *, struct attr_abbrev *,
1314 static unsigned int read_1_byte (bfd *, const gdb_byte *);
1316 static int read_1_signed_byte (bfd *, const gdb_byte *);
1318 static unsigned int read_2_bytes (bfd *, const gdb_byte *);
1320 static unsigned int read_4_bytes (bfd *, const gdb_byte *);
1322 static ULONGEST read_8_bytes (bfd *, const gdb_byte *);
1324 static CORE_ADDR read_address (bfd *, const gdb_byte *ptr, struct dwarf2_cu *,
1327 static LONGEST read_initial_length (bfd *, const gdb_byte *, unsigned int *);
1329 static LONGEST read_checked_initial_length_and_offset
1330 (bfd *, const gdb_byte *, const struct comp_unit_head *,
1331 unsigned int *, unsigned int *);
1333 static LONGEST read_offset (bfd *, const gdb_byte *,
1334 const struct comp_unit_head *,
1337 static LONGEST read_offset_1 (bfd *, const gdb_byte *, unsigned int);
1339 static sect_offset read_abbrev_offset (struct dwarf2_section_info *,
1342 static const gdb_byte *read_n_bytes (bfd *, const gdb_byte *, unsigned int);
1344 static const char *read_direct_string (bfd *, const gdb_byte *, unsigned int *);
1346 static const char *read_indirect_string (bfd *, const gdb_byte *,
1347 const struct comp_unit_head *,
1350 static const char *read_indirect_string_from_dwz (struct dwz_file *, LONGEST);
1352 static ULONGEST read_unsigned_leb128 (bfd *, const gdb_byte *, unsigned int *);
1354 static LONGEST read_signed_leb128 (bfd *, const gdb_byte *, unsigned int *);
1356 static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *,
1360 static const char *read_str_index (const struct die_reader_specs *reader,
1361 struct dwarf2_cu *cu, ULONGEST str_index);
1363 static void set_cu_language (unsigned int, struct dwarf2_cu *);
1365 static struct attribute *dwarf2_attr (struct die_info *, unsigned int,
1366 struct dwarf2_cu *);
1368 static struct attribute *dwarf2_attr_no_follow (struct die_info *,
1371 static int dwarf2_flag_true_p (struct die_info *die, unsigned name,
1372 struct dwarf2_cu *cu);
1374 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu);
1376 static struct die_info *die_specification (struct die_info *die,
1377 struct dwarf2_cu **);
1379 static void free_line_header (struct line_header *lh);
1381 static struct line_header *dwarf_decode_line_header (unsigned int offset,
1382 struct dwarf2_cu *cu);
1384 static void dwarf_decode_lines (struct line_header *, const char *,
1385 struct dwarf2_cu *, struct partial_symtab *,
1388 static void dwarf2_start_subfile (const char *, const char *, const char *);
1390 static void dwarf2_start_symtab (struct dwarf2_cu *,
1391 const char *, const char *, CORE_ADDR);
1393 static struct symbol *new_symbol (struct die_info *, struct type *,
1394 struct dwarf2_cu *);
1396 static struct symbol *new_symbol_full (struct die_info *, struct type *,
1397 struct dwarf2_cu *, struct symbol *);
1399 static void dwarf2_const_value (const struct attribute *, struct symbol *,
1400 struct dwarf2_cu *);
1402 static void dwarf2_const_value_attr (const struct attribute *attr,
1405 struct obstack *obstack,
1406 struct dwarf2_cu *cu, LONGEST *value,
1407 const gdb_byte **bytes,
1408 struct dwarf2_locexpr_baton **baton);
1410 static struct type *die_type (struct die_info *, struct dwarf2_cu *);
1412 static int need_gnat_info (struct dwarf2_cu *);
1414 static struct type *die_descriptive_type (struct die_info *,
1415 struct dwarf2_cu *);
1417 static void set_descriptive_type (struct type *, struct die_info *,
1418 struct dwarf2_cu *);
1420 static struct type *die_containing_type (struct die_info *,
1421 struct dwarf2_cu *);
1423 static struct type *lookup_die_type (struct die_info *, const struct attribute *,
1424 struct dwarf2_cu *);
1426 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *);
1428 static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *);
1430 static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *);
1432 static char *typename_concat (struct obstack *obs, const char *prefix,
1433 const char *suffix, int physname,
1434 struct dwarf2_cu *cu);
1436 static void read_file_scope (struct die_info *, struct dwarf2_cu *);
1438 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *);
1440 static void read_func_scope (struct die_info *, struct dwarf2_cu *);
1442 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *);
1444 static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu);
1446 static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *,
1447 struct dwarf2_cu *, struct partial_symtab *);
1449 static int dwarf2_get_pc_bounds (struct die_info *,
1450 CORE_ADDR *, CORE_ADDR *, struct dwarf2_cu *,
1451 struct partial_symtab *);
1453 static void get_scope_pc_bounds (struct die_info *,
1454 CORE_ADDR *, CORE_ADDR *,
1455 struct dwarf2_cu *);
1457 static void dwarf2_record_block_ranges (struct die_info *, struct block *,
1458 CORE_ADDR, struct dwarf2_cu *);
1460 static void dwarf2_add_field (struct field_info *, struct die_info *,
1461 struct dwarf2_cu *);
1463 static void dwarf2_attach_fields_to_type (struct field_info *,
1464 struct type *, struct dwarf2_cu *);
1466 static void dwarf2_add_member_fn (struct field_info *,
1467 struct die_info *, struct type *,
1468 struct dwarf2_cu *);
1470 static void dwarf2_attach_fn_fields_to_type (struct field_info *,
1472 struct dwarf2_cu *);
1474 static void process_structure_scope (struct die_info *, struct dwarf2_cu *);
1476 static void read_common_block (struct die_info *, struct dwarf2_cu *);
1478 static void read_namespace (struct die_info *die, struct dwarf2_cu *);
1480 static void read_module (struct die_info *die, struct dwarf2_cu *cu);
1482 static void read_import_statement (struct die_info *die, struct dwarf2_cu *);
1484 static struct type *read_module_type (struct die_info *die,
1485 struct dwarf2_cu *cu);
1487 static const char *namespace_name (struct die_info *die,
1488 int *is_anonymous, struct dwarf2_cu *);
1490 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *);
1492 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *);
1494 static enum dwarf_array_dim_ordering read_array_order (struct die_info *,
1495 struct dwarf2_cu *);
1497 static struct die_info *read_die_and_siblings_1
1498 (const struct die_reader_specs *, const gdb_byte *, const gdb_byte **,
1501 static struct die_info *read_die_and_siblings (const struct die_reader_specs *,
1502 const gdb_byte *info_ptr,
1503 const gdb_byte **new_info_ptr,
1504 struct die_info *parent);
1506 static const gdb_byte *read_full_die_1 (const struct die_reader_specs *,
1507 struct die_info **, const gdb_byte *,
1510 static const gdb_byte *read_full_die (const struct die_reader_specs *,
1511 struct die_info **, const gdb_byte *,
1514 static void process_die (struct die_info *, struct dwarf2_cu *);
1516 static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *,
1519 static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *);
1521 static const char *dwarf2_full_name (const char *name,
1522 struct die_info *die,
1523 struct dwarf2_cu *cu);
1525 static const char *dwarf2_physname (const char *name, struct die_info *die,
1526 struct dwarf2_cu *cu);
1528 static struct die_info *dwarf2_extension (struct die_info *die,
1529 struct dwarf2_cu **);
1531 static const char *dwarf_tag_name (unsigned int);
1533 static const char *dwarf_attr_name (unsigned int);
1535 static const char *dwarf_form_name (unsigned int);
1537 static char *dwarf_bool_name (unsigned int);
1539 static const char *dwarf_type_encoding_name (unsigned int);
1541 static struct die_info *sibling_die (struct die_info *);
1543 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *);
1545 static void dump_die_for_error (struct die_info *);
1547 static void dump_die_1 (struct ui_file *, int level, int max_level,
1550 /*static*/ void dump_die (struct die_info *, int max_level);
1552 static void store_in_ref_table (struct die_info *,
1553 struct dwarf2_cu *);
1555 static sect_offset dwarf2_get_ref_die_offset (const struct attribute *);
1557 static LONGEST dwarf2_get_attr_constant_value (const struct attribute *, int);
1559 static struct die_info *follow_die_ref_or_sig (struct die_info *,
1560 const struct attribute *,
1561 struct dwarf2_cu **);
1563 static struct die_info *follow_die_ref (struct die_info *,
1564 const struct attribute *,
1565 struct dwarf2_cu **);
1567 static struct die_info *follow_die_sig (struct die_info *,
1568 const struct attribute *,
1569 struct dwarf2_cu **);
1571 static struct type *get_signatured_type (struct die_info *, ULONGEST,
1572 struct dwarf2_cu *);
1574 static struct type *get_DW_AT_signature_type (struct die_info *,
1575 const struct attribute *,
1576 struct dwarf2_cu *);
1578 static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu);
1580 static void read_signatured_type (struct signatured_type *);
1582 static struct type_unit_group *get_type_unit_group
1583 (struct dwarf2_cu *, const struct attribute *);
1585 static void build_type_unit_groups (die_reader_func_ftype *, void *);
1587 /* memory allocation interface */
1589 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *);
1591 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int);
1593 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int,
1596 static int attr_form_is_block (const struct attribute *);
1598 static int attr_form_is_section_offset (const struct attribute *);
1600 static int attr_form_is_constant (const struct attribute *);
1602 static int attr_form_is_ref (const struct attribute *);
1604 static void fill_in_loclist_baton (struct dwarf2_cu *cu,
1605 struct dwarf2_loclist_baton *baton,
1606 const struct attribute *attr);
1608 static void dwarf2_symbol_mark_computed (const struct attribute *attr,
1610 struct dwarf2_cu *cu,
1613 static const gdb_byte *skip_one_die (const struct die_reader_specs *reader,
1614 const gdb_byte *info_ptr,
1615 struct abbrev_info *abbrev);
1617 static void free_stack_comp_unit (void *);
1619 static hashval_t partial_die_hash (const void *item);
1621 static int partial_die_eq (const void *item_lhs, const void *item_rhs);
1623 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit
1624 (sect_offset offset, unsigned int offset_in_dwz, struct objfile *objfile);
1626 static void init_one_comp_unit (struct dwarf2_cu *cu,
1627 struct dwarf2_per_cu_data *per_cu);
1629 static void prepare_one_comp_unit (struct dwarf2_cu *cu,
1630 struct die_info *comp_unit_die,
1631 enum language pretend_language);
1633 static void free_heap_comp_unit (void *);
1635 static void free_cached_comp_units (void *);
1637 static void age_cached_comp_units (void);
1639 static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *);
1641 static struct type *set_die_type (struct die_info *, struct type *,
1642 struct dwarf2_cu *);
1644 static void create_all_comp_units (struct objfile *);
1646 static int create_all_type_units (struct objfile *);
1648 static void load_full_comp_unit (struct dwarf2_per_cu_data *,
1651 static void process_full_comp_unit (struct dwarf2_per_cu_data *,
1654 static void process_full_type_unit (struct dwarf2_per_cu_data *,
1657 static void dwarf2_add_dependence (struct dwarf2_cu *,
1658 struct dwarf2_per_cu_data *);
1660 static void dwarf2_mark (struct dwarf2_cu *);
1662 static void dwarf2_clear_marks (struct dwarf2_per_cu_data *);
1664 static struct type *get_die_type_at_offset (sect_offset,
1665 struct dwarf2_per_cu_data *);
1667 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu);
1669 static void dwarf2_release_queue (void *dummy);
1671 static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
1672 enum language pretend_language);
1674 static void process_queue (void);
1676 static void find_file_and_directory (struct die_info *die,
1677 struct dwarf2_cu *cu,
1678 const char **name, const char **comp_dir);
1680 static char *file_full_name (int file, struct line_header *lh,
1681 const char *comp_dir);
1683 static const gdb_byte *read_and_check_comp_unit_head
1684 (struct comp_unit_head *header,
1685 struct dwarf2_section_info *section,
1686 struct dwarf2_section_info *abbrev_section, const gdb_byte *info_ptr,
1687 int is_debug_types_section);
1689 static void init_cutu_and_read_dies
1690 (struct dwarf2_per_cu_data *this_cu, struct abbrev_table *abbrev_table,
1691 int use_existing_cu, int keep,
1692 die_reader_func_ftype *die_reader_func, void *data);
1694 static void init_cutu_and_read_dies_simple
1695 (struct dwarf2_per_cu_data *this_cu,
1696 die_reader_func_ftype *die_reader_func, void *data);
1698 static htab_t allocate_signatured_type_table (struct objfile *objfile);
1700 static htab_t allocate_dwo_unit_table (struct objfile *objfile);
1702 static struct dwo_unit *lookup_dwo_in_dwp
1703 (struct dwp_file *dwp_file, const struct dwp_hash_table *htab,
1704 const char *comp_dir, ULONGEST signature, int is_debug_types);
1706 static struct dwp_file *get_dwp_file (void);
1708 static struct dwo_unit *lookup_dwo_comp_unit
1709 (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST);
1711 static struct dwo_unit *lookup_dwo_type_unit
1712 (struct signatured_type *, const char *, const char *);
1714 static void queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *);
1716 static void free_dwo_file_cleanup (void *);
1718 static void process_cu_includes (void);
1720 static void check_producer (struct dwarf2_cu *cu);
1722 /* Various complaints about symbol reading that don't abort the process. */
1725 dwarf2_statement_list_fits_in_line_number_section_complaint (void)
1727 complaint (&symfile_complaints,
1728 _("statement list doesn't fit in .debug_line section"));
1732 dwarf2_debug_line_missing_file_complaint (void)
1734 complaint (&symfile_complaints,
1735 _(".debug_line section has line data without a file"));
1739 dwarf2_debug_line_missing_end_sequence_complaint (void)
1741 complaint (&symfile_complaints,
1742 _(".debug_line section has line "
1743 "program sequence without an end"));
1747 dwarf2_complex_location_expr_complaint (void)
1749 complaint (&symfile_complaints, _("location expression too complex"));
1753 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
1756 complaint (&symfile_complaints,
1757 _("const value length mismatch for '%s', got %d, expected %d"),
1762 dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section)
1764 complaint (&symfile_complaints,
1765 _("debug info runs off end of %s section"
1767 section->asection->name,
1768 bfd_get_filename (section->asection->owner));
1772 dwarf2_macro_malformed_definition_complaint (const char *arg1)
1774 complaint (&symfile_complaints,
1775 _("macro debug info contains a "
1776 "malformed macro definition:\n`%s'"),
1781 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2)
1783 complaint (&symfile_complaints,
1784 _("invalid attribute class or form for '%s' in '%s'"),
1790 /* Convert VALUE between big- and little-endian. */
1792 byte_swap (offset_type value)
1796 result = (value & 0xff) << 24;
1797 result |= (value & 0xff00) << 8;
1798 result |= (value & 0xff0000) >> 8;
1799 result |= (value & 0xff000000) >> 24;
1803 #define MAYBE_SWAP(V) byte_swap (V)
1806 #define MAYBE_SWAP(V) (V)
1807 #endif /* WORDS_BIGENDIAN */
1809 /* The suffix for an index file. */
1810 #define INDEX_SUFFIX ".gdb-index"
1812 /* Try to locate the sections we need for DWARF 2 debugging
1813 information and return true if we have enough to do something.
1814 NAMES points to the dwarf2 section names, or is NULL if the standard
1815 ELF names are used. */
1818 dwarf2_has_info (struct objfile *objfile,
1819 const struct dwarf2_debug_sections *names)
1821 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
1822 if (!dwarf2_per_objfile)
1824 /* Initialize per-objfile state. */
1825 struct dwarf2_per_objfile *data
1826 = obstack_alloc (&objfile->objfile_obstack, sizeof (*data));
1828 memset (data, 0, sizeof (*data));
1829 set_objfile_data (objfile, dwarf2_objfile_data_key, data);
1830 dwarf2_per_objfile = data;
1832 bfd_map_over_sections (objfile->obfd, dwarf2_locate_sections,
1834 dwarf2_per_objfile->objfile = objfile;
1836 return (dwarf2_per_objfile->info.asection != NULL
1837 && dwarf2_per_objfile->abbrev.asection != NULL);
1840 /* When loading sections, we look either for uncompressed section or for
1841 compressed section names. */
1844 section_is_p (const char *section_name,
1845 const struct dwarf2_section_names *names)
1847 if (names->normal != NULL
1848 && strcmp (section_name, names->normal) == 0)
1850 if (names->compressed != NULL
1851 && strcmp (section_name, names->compressed) == 0)
1856 /* This function is mapped across the sections and remembers the
1857 offset and size of each of the debugging sections we are interested
1861 dwarf2_locate_sections (bfd *abfd, asection *sectp, void *vnames)
1863 const struct dwarf2_debug_sections *names;
1864 flagword aflag = bfd_get_section_flags (abfd, sectp);
1867 names = &dwarf2_elf_names;
1869 names = (const struct dwarf2_debug_sections *) vnames;
1871 if ((aflag & SEC_HAS_CONTENTS) == 0)
1874 else if (section_is_p (sectp->name, &names->info))
1876 dwarf2_per_objfile->info.asection = sectp;
1877 dwarf2_per_objfile->info.size = bfd_get_section_size (sectp);
1879 else if (section_is_p (sectp->name, &names->abbrev))
1881 dwarf2_per_objfile->abbrev.asection = sectp;
1882 dwarf2_per_objfile->abbrev.size = bfd_get_section_size (sectp);
1884 else if (section_is_p (sectp->name, &names->line))
1886 dwarf2_per_objfile->line.asection = sectp;
1887 dwarf2_per_objfile->line.size = bfd_get_section_size (sectp);
1889 else if (section_is_p (sectp->name, &names->loc))
1891 dwarf2_per_objfile->loc.asection = sectp;
1892 dwarf2_per_objfile->loc.size = bfd_get_section_size (sectp);
1894 else if (section_is_p (sectp->name, &names->macinfo))
1896 dwarf2_per_objfile->macinfo.asection = sectp;
1897 dwarf2_per_objfile->macinfo.size = bfd_get_section_size (sectp);
1899 else if (section_is_p (sectp->name, &names->macro))
1901 dwarf2_per_objfile->macro.asection = sectp;
1902 dwarf2_per_objfile->macro.size = bfd_get_section_size (sectp);
1904 else if (section_is_p (sectp->name, &names->str))
1906 dwarf2_per_objfile->str.asection = sectp;
1907 dwarf2_per_objfile->str.size = bfd_get_section_size (sectp);
1909 else if (section_is_p (sectp->name, &names->addr))
1911 dwarf2_per_objfile->addr.asection = sectp;
1912 dwarf2_per_objfile->addr.size = bfd_get_section_size (sectp);
1914 else if (section_is_p (sectp->name, &names->frame))
1916 dwarf2_per_objfile->frame.asection = sectp;
1917 dwarf2_per_objfile->frame.size = bfd_get_section_size (sectp);
1919 else if (section_is_p (sectp->name, &names->eh_frame))
1921 dwarf2_per_objfile->eh_frame.asection = sectp;
1922 dwarf2_per_objfile->eh_frame.size = bfd_get_section_size (sectp);
1924 else if (section_is_p (sectp->name, &names->ranges))
1926 dwarf2_per_objfile->ranges.asection = sectp;
1927 dwarf2_per_objfile->ranges.size = bfd_get_section_size (sectp);
1929 else if (section_is_p (sectp->name, &names->types))
1931 struct dwarf2_section_info type_section;
1933 memset (&type_section, 0, sizeof (type_section));
1934 type_section.asection = sectp;
1935 type_section.size = bfd_get_section_size (sectp);
1937 VEC_safe_push (dwarf2_section_info_def, dwarf2_per_objfile->types,
1940 else if (section_is_p (sectp->name, &names->gdb_index))
1942 dwarf2_per_objfile->gdb_index.asection = sectp;
1943 dwarf2_per_objfile->gdb_index.size = bfd_get_section_size (sectp);
1946 if ((bfd_get_section_flags (abfd, sectp) & SEC_LOAD)
1947 && bfd_section_vma (abfd, sectp) == 0)
1948 dwarf2_per_objfile->has_section_at_zero = 1;
1951 /* A helper function that decides whether a section is empty,
1955 dwarf2_section_empty_p (struct dwarf2_section_info *info)
1957 return info->asection == NULL || info->size == 0;
1960 /* Read the contents of the section INFO.
1961 OBJFILE is the main object file, but not necessarily the file where
1962 the section comes from. E.g., for DWO files INFO->asection->owner
1963 is the bfd of the DWO file.
1964 If the section is compressed, uncompress it before returning. */
1967 dwarf2_read_section (struct objfile *objfile, struct dwarf2_section_info *info)
1969 asection *sectp = info->asection;
1971 gdb_byte *buf, *retbuf;
1972 unsigned char header[4];
1976 info->buffer = NULL;
1979 if (dwarf2_section_empty_p (info))
1982 abfd = sectp->owner;
1984 /* If the section has relocations, we must read it ourselves.
1985 Otherwise we attach it to the BFD. */
1986 if ((sectp->flags & SEC_RELOC) == 0)
1988 info->buffer = gdb_bfd_map_section (sectp, &info->size);
1992 buf = obstack_alloc (&objfile->objfile_obstack, info->size);
1995 /* When debugging .o files, we may need to apply relocations; see
1996 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html .
1997 We never compress sections in .o files, so we only need to
1998 try this when the section is not compressed. */
1999 retbuf = symfile_relocate_debug_section (objfile, sectp, buf);
2002 info->buffer = retbuf;
2006 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
2007 || bfd_bread (buf, info->size, abfd) != info->size)
2008 error (_("Dwarf Error: Can't read DWARF data from '%s'"),
2009 bfd_get_filename (abfd));
2012 /* A helper function that returns the size of a section in a safe way.
2013 If you are positive that the section has been read before using the
2014 size, then it is safe to refer to the dwarf2_section_info object's
2015 "size" field directly. In other cases, you must call this
2016 function, because for compressed sections the size field is not set
2017 correctly until the section has been read. */
2019 static bfd_size_type
2020 dwarf2_section_size (struct objfile *objfile,
2021 struct dwarf2_section_info *info)
2024 dwarf2_read_section (objfile, info);
2028 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and
2032 dwarf2_get_section_info (struct objfile *objfile,
2033 enum dwarf2_section_enum sect,
2034 asection **sectp, const gdb_byte **bufp,
2035 bfd_size_type *sizep)
2037 struct dwarf2_per_objfile *data
2038 = objfile_data (objfile, dwarf2_objfile_data_key);
2039 struct dwarf2_section_info *info;
2041 /* We may see an objfile without any DWARF, in which case we just
2052 case DWARF2_DEBUG_FRAME:
2053 info = &data->frame;
2055 case DWARF2_EH_FRAME:
2056 info = &data->eh_frame;
2059 gdb_assert_not_reached ("unexpected section");
2062 dwarf2_read_section (objfile, info);
2064 *sectp = info->asection;
2065 *bufp = info->buffer;
2066 *sizep = info->size;
2069 /* A helper function to find the sections for a .dwz file. */
2072 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg)
2074 struct dwz_file *dwz_file = arg;
2076 /* Note that we only support the standard ELF names, because .dwz
2077 is ELF-only (at the time of writing). */
2078 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev))
2080 dwz_file->abbrev.asection = sectp;
2081 dwz_file->abbrev.size = bfd_get_section_size (sectp);
2083 else if (section_is_p (sectp->name, &dwarf2_elf_names.info))
2085 dwz_file->info.asection = sectp;
2086 dwz_file->info.size = bfd_get_section_size (sectp);
2088 else if (section_is_p (sectp->name, &dwarf2_elf_names.str))
2090 dwz_file->str.asection = sectp;
2091 dwz_file->str.size = bfd_get_section_size (sectp);
2093 else if (section_is_p (sectp->name, &dwarf2_elf_names.line))
2095 dwz_file->line.asection = sectp;
2096 dwz_file->line.size = bfd_get_section_size (sectp);
2098 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro))
2100 dwz_file->macro.asection = sectp;
2101 dwz_file->macro.size = bfd_get_section_size (sectp);
2103 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index))
2105 dwz_file->gdb_index.asection = sectp;
2106 dwz_file->gdb_index.size = bfd_get_section_size (sectp);
2110 /* Open the separate '.dwz' debug file, if needed. Return NULL if
2111 there is no .gnu_debugaltlink section in the file. Error if there
2112 is such a section but the file cannot be found. */
2114 static struct dwz_file *
2115 dwarf2_get_dwz_file (void)
2119 struct cleanup *cleanup;
2120 const char *filename;
2121 struct dwz_file *result;
2122 unsigned long buildid;
2124 if (dwarf2_per_objfile->dwz_file != NULL)
2125 return dwarf2_per_objfile->dwz_file;
2127 bfd_set_error (bfd_error_no_error);
2128 data = bfd_get_alt_debug_link_info (dwarf2_per_objfile->objfile->obfd,
2132 if (bfd_get_error () == bfd_error_no_error)
2134 error (_("could not read '.gnu_debugaltlink' section: %s"),
2135 bfd_errmsg (bfd_get_error ()));
2137 cleanup = make_cleanup (xfree, data);
2139 filename = (const char *) data;
2140 if (!IS_ABSOLUTE_PATH (filename))
2142 char *abs = gdb_realpath (objfile_name (dwarf2_per_objfile->objfile));
2145 make_cleanup (xfree, abs);
2146 abs = ldirname (abs);
2147 make_cleanup (xfree, abs);
2149 rel = concat (abs, SLASH_STRING, filename, (char *) NULL);
2150 make_cleanup (xfree, rel);
2154 /* The format is just a NUL-terminated file name, followed by the
2155 build-id. For now, though, we ignore the build-id. */
2156 dwz_bfd = gdb_bfd_open (filename, gnutarget, -1);
2157 if (dwz_bfd == NULL)
2158 error (_("could not read '%s': %s"), filename,
2159 bfd_errmsg (bfd_get_error ()));
2161 if (!bfd_check_format (dwz_bfd, bfd_object))
2163 gdb_bfd_unref (dwz_bfd);
2164 error (_("file '%s' was not usable: %s"), filename,
2165 bfd_errmsg (bfd_get_error ()));
2168 result = OBSTACK_ZALLOC (&dwarf2_per_objfile->objfile->objfile_obstack,
2170 result->dwz_bfd = dwz_bfd;
2172 bfd_map_over_sections (dwz_bfd, locate_dwz_sections, result);
2174 do_cleanups (cleanup);
2176 dwarf2_per_objfile->dwz_file = result;
2180 /* DWARF quick_symbols_functions support. */
2182 /* TUs can share .debug_line entries, and there can be a lot more TUs than
2183 unique line tables, so we maintain a separate table of all .debug_line
2184 derived entries to support the sharing.
2185 All the quick functions need is the list of file names. We discard the
2186 line_header when we're done and don't need to record it here. */
2187 struct quick_file_names
2189 /* The data used to construct the hash key. */
2190 struct stmt_list_hash hash;
2192 /* The number of entries in file_names, real_names. */
2193 unsigned int num_file_names;
2195 /* The file names from the line table, after being run through
2197 const char **file_names;
2199 /* The file names from the line table after being run through
2200 gdb_realpath. These are computed lazily. */
2201 const char **real_names;
2204 /* When using the index (and thus not using psymtabs), each CU has an
2205 object of this type. This is used to hold information needed by
2206 the various "quick" methods. */
2207 struct dwarf2_per_cu_quick_data
2209 /* The file table. This can be NULL if there was no file table
2210 or it's currently not read in.
2211 NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */
2212 struct quick_file_names *file_names;
2214 /* The corresponding symbol table. This is NULL if symbols for this
2215 CU have not yet been read. */
2216 struct symtab *symtab;
2218 /* A temporary mark bit used when iterating over all CUs in
2219 expand_symtabs_matching. */
2220 unsigned int mark : 1;
2222 /* True if we've tried to read the file table and found there isn't one.
2223 There will be no point in trying to read it again next time. */
2224 unsigned int no_file_data : 1;
2227 /* Utility hash function for a stmt_list_hash. */
2230 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash)
2234 if (stmt_list_hash->dwo_unit != NULL)
2235 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file;
2236 v += stmt_list_hash->line_offset.sect_off;
2240 /* Utility equality function for a stmt_list_hash. */
2243 eq_stmt_list_entry (const struct stmt_list_hash *lhs,
2244 const struct stmt_list_hash *rhs)
2246 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL))
2248 if (lhs->dwo_unit != NULL
2249 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file)
2252 return lhs->line_offset.sect_off == rhs->line_offset.sect_off;
2255 /* Hash function for a quick_file_names. */
2258 hash_file_name_entry (const void *e)
2260 const struct quick_file_names *file_data = e;
2262 return hash_stmt_list_entry (&file_data->hash);
2265 /* Equality function for a quick_file_names. */
2268 eq_file_name_entry (const void *a, const void *b)
2270 const struct quick_file_names *ea = a;
2271 const struct quick_file_names *eb = b;
2273 return eq_stmt_list_entry (&ea->hash, &eb->hash);
2276 /* Delete function for a quick_file_names. */
2279 delete_file_name_entry (void *e)
2281 struct quick_file_names *file_data = e;
2284 for (i = 0; i < file_data->num_file_names; ++i)
2286 xfree ((void*) file_data->file_names[i]);
2287 if (file_data->real_names)
2288 xfree ((void*) file_data->real_names[i]);
2291 /* The space for the struct itself lives on objfile_obstack,
2292 so we don't free it here. */
2295 /* Create a quick_file_names hash table. */
2298 create_quick_file_names_table (unsigned int nr_initial_entries)
2300 return htab_create_alloc (nr_initial_entries,
2301 hash_file_name_entry, eq_file_name_entry,
2302 delete_file_name_entry, xcalloc, xfree);
2305 /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would
2306 have to be created afterwards. You should call age_cached_comp_units after
2307 processing PER_CU->CU. dw2_setup must have been already called. */
2310 load_cu (struct dwarf2_per_cu_data *per_cu)
2312 if (per_cu->is_debug_types)
2313 load_full_type_unit (per_cu);
2315 load_full_comp_unit (per_cu, language_minimal);
2317 gdb_assert (per_cu->cu != NULL);
2319 dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu);
2322 /* Read in the symbols for PER_CU. */
2325 dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2327 struct cleanup *back_to;
2329 /* Skip type_unit_groups, reading the type units they contain
2330 is handled elsewhere. */
2331 if (IS_TYPE_UNIT_GROUP (per_cu))
2334 back_to = make_cleanup (dwarf2_release_queue, NULL);
2336 if (dwarf2_per_objfile->using_index
2337 ? per_cu->v.quick->symtab == NULL
2338 : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin))
2340 queue_comp_unit (per_cu, language_minimal);
2343 /* If we just loaded a CU from a DWO, and we're working with an index
2344 that may badly handle TUs, load all the TUs in that DWO as well.
2345 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
2346 if (!per_cu->is_debug_types
2347 && per_cu->cu->dwo_unit != NULL
2348 && dwarf2_per_objfile->index_table != NULL
2349 && dwarf2_per_objfile->index_table->version <= 7
2350 /* DWP files aren't supported yet. */
2351 && get_dwp_file () == NULL)
2352 queue_and_load_all_dwo_tus (per_cu);
2357 /* Age the cache, releasing compilation units that have not
2358 been used recently. */
2359 age_cached_comp_units ();
2361 do_cleanups (back_to);
2364 /* Ensure that the symbols for PER_CU have been read in. OBJFILE is
2365 the objfile from which this CU came. Returns the resulting symbol
2368 static struct symtab *
2369 dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2371 gdb_assert (dwarf2_per_objfile->using_index);
2372 if (!per_cu->v.quick->symtab)
2374 struct cleanup *back_to = make_cleanup (free_cached_comp_units, NULL);
2375 increment_reading_symtab ();
2376 dw2_do_instantiate_symtab (per_cu);
2377 process_cu_includes ();
2378 do_cleanups (back_to);
2380 return per_cu->v.quick->symtab;
2383 /* Return the CU given its index.
2385 This is intended for loops like:
2387 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
2388 + dwarf2_per_objfile->n_type_units); ++i)
2390 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
2396 static struct dwarf2_per_cu_data *
2397 dw2_get_cu (int index)
2399 if (index >= dwarf2_per_objfile->n_comp_units)
2401 index -= dwarf2_per_objfile->n_comp_units;
2402 gdb_assert (index < dwarf2_per_objfile->n_type_units);
2403 return &dwarf2_per_objfile->all_type_units[index]->per_cu;
2406 return dwarf2_per_objfile->all_comp_units[index];
2409 /* Return the primary CU given its index.
2410 The difference between this function and dw2_get_cu is in the handling
2411 of type units (TUs). Here we return the type_unit_group object.
2413 This is intended for loops like:
2415 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
2416 + dwarf2_per_objfile->n_type_unit_groups); ++i)
2418 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
2424 static struct dwarf2_per_cu_data *
2425 dw2_get_primary_cu (int index)
2427 if (index >= dwarf2_per_objfile->n_comp_units)
2429 index -= dwarf2_per_objfile->n_comp_units;
2430 gdb_assert (index < dwarf2_per_objfile->n_type_unit_groups);
2431 return &dwarf2_per_objfile->all_type_unit_groups[index]->per_cu;
2434 return dwarf2_per_objfile->all_comp_units[index];
2437 /* A helper for create_cus_from_index that handles a given list of
2441 create_cus_from_index_list (struct objfile *objfile,
2442 const gdb_byte *cu_list, offset_type n_elements,
2443 struct dwarf2_section_info *section,
2449 for (i = 0; i < n_elements; i += 2)
2451 struct dwarf2_per_cu_data *the_cu;
2452 ULONGEST offset, length;
2454 gdb_static_assert (sizeof (ULONGEST) >= 8);
2455 offset = extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
2456 length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
2459 the_cu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2460 struct dwarf2_per_cu_data);
2461 the_cu->offset.sect_off = offset;
2462 the_cu->length = length;
2463 the_cu->objfile = objfile;
2464 the_cu->section = section;
2465 the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2466 struct dwarf2_per_cu_quick_data);
2467 the_cu->is_dwz = is_dwz;
2468 dwarf2_per_objfile->all_comp_units[base_offset + i / 2] = the_cu;
2472 /* Read the CU list from the mapped index, and use it to create all
2473 the CU objects for this objfile. */
2476 create_cus_from_index (struct objfile *objfile,
2477 const gdb_byte *cu_list, offset_type cu_list_elements,
2478 const gdb_byte *dwz_list, offset_type dwz_elements)
2480 struct dwz_file *dwz;
2482 dwarf2_per_objfile->n_comp_units = (cu_list_elements + dwz_elements) / 2;
2483 dwarf2_per_objfile->all_comp_units
2484 = obstack_alloc (&objfile->objfile_obstack,
2485 dwarf2_per_objfile->n_comp_units
2486 * sizeof (struct dwarf2_per_cu_data *));
2488 create_cus_from_index_list (objfile, cu_list, cu_list_elements,
2489 &dwarf2_per_objfile->info, 0, 0);
2491 if (dwz_elements == 0)
2494 dwz = dwarf2_get_dwz_file ();
2495 create_cus_from_index_list (objfile, dwz_list, dwz_elements, &dwz->info, 1,
2496 cu_list_elements / 2);
2499 /* Create the signatured type hash table from the index. */
2502 create_signatured_type_table_from_index (struct objfile *objfile,
2503 struct dwarf2_section_info *section,
2504 const gdb_byte *bytes,
2505 offset_type elements)
2508 htab_t sig_types_hash;
2510 dwarf2_per_objfile->n_type_units = elements / 3;
2511 dwarf2_per_objfile->all_type_units
2512 = xmalloc (dwarf2_per_objfile->n_type_units
2513 * sizeof (struct signatured_type *));
2515 sig_types_hash = allocate_signatured_type_table (objfile);
2517 for (i = 0; i < elements; i += 3)
2519 struct signatured_type *sig_type;
2520 ULONGEST offset, type_offset_in_tu, signature;
2523 gdb_static_assert (sizeof (ULONGEST) >= 8);
2524 offset = extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
2525 type_offset_in_tu = extract_unsigned_integer (bytes + 8, 8,
2527 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
2530 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2531 struct signatured_type);
2532 sig_type->signature = signature;
2533 sig_type->type_offset_in_tu.cu_off = type_offset_in_tu;
2534 sig_type->per_cu.is_debug_types = 1;
2535 sig_type->per_cu.section = section;
2536 sig_type->per_cu.offset.sect_off = offset;
2537 sig_type->per_cu.objfile = objfile;
2538 sig_type->per_cu.v.quick
2539 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2540 struct dwarf2_per_cu_quick_data);
2542 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
2545 dwarf2_per_objfile->all_type_units[i / 3] = sig_type;
2548 dwarf2_per_objfile->signatured_types = sig_types_hash;
2551 /* Read the address map data from the mapped index, and use it to
2552 populate the objfile's psymtabs_addrmap. */
2555 create_addrmap_from_index (struct objfile *objfile, struct mapped_index *index)
2557 const gdb_byte *iter, *end;
2558 struct obstack temp_obstack;
2559 struct addrmap *mutable_map;
2560 struct cleanup *cleanup;
2563 obstack_init (&temp_obstack);
2564 cleanup = make_cleanup_obstack_free (&temp_obstack);
2565 mutable_map = addrmap_create_mutable (&temp_obstack);
2567 iter = index->address_table;
2568 end = iter + index->address_table_size;
2570 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
2574 ULONGEST hi, lo, cu_index;
2575 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
2577 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
2579 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
2584 complaint (&symfile_complaints,
2585 _(".gdb_index address table has invalid range (%s - %s)"),
2586 hex_string (lo), hex_string (hi));
2590 if (cu_index >= dwarf2_per_objfile->n_comp_units)
2592 complaint (&symfile_complaints,
2593 _(".gdb_index address table has invalid CU number %u"),
2594 (unsigned) cu_index);
2598 addrmap_set_empty (mutable_map, lo + baseaddr, hi + baseaddr - 1,
2599 dw2_get_cu (cu_index));
2602 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
2603 &objfile->objfile_obstack);
2604 do_cleanups (cleanup);
2607 /* The hash function for strings in the mapped index. This is the same as
2608 SYMBOL_HASH_NEXT, but we keep a separate copy to maintain control over the
2609 implementation. This is necessary because the hash function is tied to the
2610 format of the mapped index file. The hash values do not have to match with
2613 Use INT_MAX for INDEX_VERSION if you generate the current index format. */
2616 mapped_index_string_hash (int index_version, const void *p)
2618 const unsigned char *str = (const unsigned char *) p;
2622 while ((c = *str++) != 0)
2624 if (index_version >= 5)
2626 r = r * 67 + c - 113;
2632 /* Find a slot in the mapped index INDEX for the object named NAME.
2633 If NAME is found, set *VEC_OUT to point to the CU vector in the
2634 constant pool and return 1. If NAME cannot be found, return 0. */
2637 find_slot_in_mapped_hash (struct mapped_index *index, const char *name,
2638 offset_type **vec_out)
2640 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
2642 offset_type slot, step;
2643 int (*cmp) (const char *, const char *);
2645 if (current_language->la_language == language_cplus
2646 || current_language->la_language == language_java
2647 || current_language->la_language == language_fortran)
2649 /* NAME is already canonical. Drop any qualifiers as .gdb_index does
2651 const char *paren = strchr (name, '(');
2657 dup = xmalloc (paren - name + 1);
2658 memcpy (dup, name, paren - name);
2659 dup[paren - name] = 0;
2661 make_cleanup (xfree, dup);
2666 /* Index version 4 did not support case insensitive searches. But the
2667 indices for case insensitive languages are built in lowercase, therefore
2668 simulate our NAME being searched is also lowercased. */
2669 hash = mapped_index_string_hash ((index->version == 4
2670 && case_sensitivity == case_sensitive_off
2671 ? 5 : index->version),
2674 slot = hash & (index->symbol_table_slots - 1);
2675 step = ((hash * 17) & (index->symbol_table_slots - 1)) | 1;
2676 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
2680 /* Convert a slot number to an offset into the table. */
2681 offset_type i = 2 * slot;
2683 if (index->symbol_table[i] == 0 && index->symbol_table[i + 1] == 0)
2685 do_cleanups (back_to);
2689 str = index->constant_pool + MAYBE_SWAP (index->symbol_table[i]);
2690 if (!cmp (name, str))
2692 *vec_out = (offset_type *) (index->constant_pool
2693 + MAYBE_SWAP (index->symbol_table[i + 1]));
2694 do_cleanups (back_to);
2698 slot = (slot + step) & (index->symbol_table_slots - 1);
2702 /* A helper function that reads the .gdb_index from SECTION and fills
2703 in MAP. FILENAME is the name of the file containing the section;
2704 it is used for error reporting. DEPRECATED_OK is nonzero if it is
2705 ok to use deprecated sections.
2707 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
2708 out parameters that are filled in with information about the CU and
2709 TU lists in the section.
2711 Returns 1 if all went well, 0 otherwise. */
2714 read_index_from_section (struct objfile *objfile,
2715 const char *filename,
2717 struct dwarf2_section_info *section,
2718 struct mapped_index *map,
2719 const gdb_byte **cu_list,
2720 offset_type *cu_list_elements,
2721 const gdb_byte **types_list,
2722 offset_type *types_list_elements)
2724 const gdb_byte *addr;
2725 offset_type version;
2726 offset_type *metadata;
2729 if (dwarf2_section_empty_p (section))
2732 /* Older elfutils strip versions could keep the section in the main
2733 executable while splitting it for the separate debug info file. */
2734 if ((bfd_get_file_flags (section->asection) & SEC_HAS_CONTENTS) == 0)
2737 dwarf2_read_section (objfile, section);
2739 addr = section->buffer;
2740 /* Version check. */
2741 version = MAYBE_SWAP (*(offset_type *) addr);
2742 /* Versions earlier than 3 emitted every copy of a psymbol. This
2743 causes the index to behave very poorly for certain requests. Version 3
2744 contained incomplete addrmap. So, it seems better to just ignore such
2748 static int warning_printed = 0;
2749 if (!warning_printed)
2751 warning (_("Skipping obsolete .gdb_index section in %s."),
2753 warning_printed = 1;
2757 /* Index version 4 uses a different hash function than index version
2760 Versions earlier than 6 did not emit psymbols for inlined
2761 functions. Using these files will cause GDB not to be able to
2762 set breakpoints on inlined functions by name, so we ignore these
2763 indices unless the user has done
2764 "set use-deprecated-index-sections on". */
2765 if (version < 6 && !deprecated_ok)
2767 static int warning_printed = 0;
2768 if (!warning_printed)
2771 Skipping deprecated .gdb_index section in %s.\n\
2772 Do \"set use-deprecated-index-sections on\" before the file is read\n\
2773 to use the section anyway."),
2775 warning_printed = 1;
2779 /* Version 7 indices generated by gold refer to the CU for a symbol instead
2780 of the TU (for symbols coming from TUs). It's just a performance bug, and
2781 we can't distinguish gdb-generated indices from gold-generated ones, so
2782 nothing to do here. */
2784 /* Indexes with higher version than the one supported by GDB may be no
2785 longer backward compatible. */
2789 map->version = version;
2790 map->total_size = section->size;
2792 metadata = (offset_type *) (addr + sizeof (offset_type));
2795 *cu_list = addr + MAYBE_SWAP (metadata[i]);
2796 *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i]))
2800 *types_list = addr + MAYBE_SWAP (metadata[i]);
2801 *types_list_elements = ((MAYBE_SWAP (metadata[i + 1])
2802 - MAYBE_SWAP (metadata[i]))
2806 map->address_table = addr + MAYBE_SWAP (metadata[i]);
2807 map->address_table_size = (MAYBE_SWAP (metadata[i + 1])
2808 - MAYBE_SWAP (metadata[i]));
2811 map->symbol_table = (offset_type *) (addr + MAYBE_SWAP (metadata[i]));
2812 map->symbol_table_slots = ((MAYBE_SWAP (metadata[i + 1])
2813 - MAYBE_SWAP (metadata[i]))
2814 / (2 * sizeof (offset_type)));
2817 map->constant_pool = (char *) (addr + MAYBE_SWAP (metadata[i]));
2823 /* Read the index file. If everything went ok, initialize the "quick"
2824 elements of all the CUs and return 1. Otherwise, return 0. */
2827 dwarf2_read_index (struct objfile *objfile)
2829 struct mapped_index local_map, *map;
2830 const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
2831 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
2832 struct dwz_file *dwz;
2834 if (!read_index_from_section (objfile, objfile_name (objfile),
2835 use_deprecated_index_sections,
2836 &dwarf2_per_objfile->gdb_index, &local_map,
2837 &cu_list, &cu_list_elements,
2838 &types_list, &types_list_elements))
2841 /* Don't use the index if it's empty. */
2842 if (local_map.symbol_table_slots == 0)
2845 /* If there is a .dwz file, read it so we can get its CU list as
2847 dwz = dwarf2_get_dwz_file ();
2850 struct mapped_index dwz_map;
2851 const gdb_byte *dwz_types_ignore;
2852 offset_type dwz_types_elements_ignore;
2854 if (!read_index_from_section (objfile, bfd_get_filename (dwz->dwz_bfd),
2856 &dwz->gdb_index, &dwz_map,
2857 &dwz_list, &dwz_list_elements,
2859 &dwz_types_elements_ignore))
2861 warning (_("could not read '.gdb_index' section from %s; skipping"),
2862 bfd_get_filename (dwz->dwz_bfd));
2867 create_cus_from_index (objfile, cu_list, cu_list_elements, dwz_list,
2870 if (types_list_elements)
2872 struct dwarf2_section_info *section;
2874 /* We can only handle a single .debug_types when we have an
2876 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
2879 section = VEC_index (dwarf2_section_info_def,
2880 dwarf2_per_objfile->types, 0);
2882 create_signatured_type_table_from_index (objfile, section, types_list,
2883 types_list_elements);
2886 create_addrmap_from_index (objfile, &local_map);
2888 map = obstack_alloc (&objfile->objfile_obstack, sizeof (struct mapped_index));
2891 dwarf2_per_objfile->index_table = map;
2892 dwarf2_per_objfile->using_index = 1;
2893 dwarf2_per_objfile->quick_file_names_table =
2894 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
2899 /* A helper for the "quick" functions which sets the global
2900 dwarf2_per_objfile according to OBJFILE. */
2903 dw2_setup (struct objfile *objfile)
2905 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
2906 gdb_assert (dwarf2_per_objfile);
2909 /* die_reader_func for dw2_get_file_names. */
2912 dw2_get_file_names_reader (const struct die_reader_specs *reader,
2913 const gdb_byte *info_ptr,
2914 struct die_info *comp_unit_die,
2918 struct dwarf2_cu *cu = reader->cu;
2919 struct dwarf2_per_cu_data *this_cu = cu->per_cu;
2920 struct objfile *objfile = dwarf2_per_objfile->objfile;
2921 struct dwarf2_per_cu_data *lh_cu;
2922 struct line_header *lh;
2923 struct attribute *attr;
2925 const char *name, *comp_dir;
2927 struct quick_file_names *qfn;
2928 unsigned int line_offset;
2930 gdb_assert (! this_cu->is_debug_types);
2932 /* Our callers never want to match partial units -- instead they
2933 will match the enclosing full CU. */
2934 if (comp_unit_die->tag == DW_TAG_partial_unit)
2936 this_cu->v.quick->no_file_data = 1;
2945 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
2948 struct quick_file_names find_entry;
2950 line_offset = DW_UNSND (attr);
2952 /* We may have already read in this line header (TU line header sharing).
2953 If we have we're done. */
2954 find_entry.hash.dwo_unit = cu->dwo_unit;
2955 find_entry.hash.line_offset.sect_off = line_offset;
2956 slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table,
2957 &find_entry, INSERT);
2960 lh_cu->v.quick->file_names = *slot;
2964 lh = dwarf_decode_line_header (line_offset, cu);
2968 lh_cu->v.quick->no_file_data = 1;
2972 qfn = obstack_alloc (&objfile->objfile_obstack, sizeof (*qfn));
2973 qfn->hash.dwo_unit = cu->dwo_unit;
2974 qfn->hash.line_offset.sect_off = line_offset;
2975 gdb_assert (slot != NULL);
2978 find_file_and_directory (comp_unit_die, cu, &name, &comp_dir);
2980 qfn->num_file_names = lh->num_file_names;
2981 qfn->file_names = obstack_alloc (&objfile->objfile_obstack,
2982 lh->num_file_names * sizeof (char *));
2983 for (i = 0; i < lh->num_file_names; ++i)
2984 qfn->file_names[i] = file_full_name (i + 1, lh, comp_dir);
2985 qfn->real_names = NULL;
2987 free_line_header (lh);
2989 lh_cu->v.quick->file_names = qfn;
2992 /* A helper for the "quick" functions which attempts to read the line
2993 table for THIS_CU. */
2995 static struct quick_file_names *
2996 dw2_get_file_names (struct dwarf2_per_cu_data *this_cu)
2998 /* This should never be called for TUs. */
2999 gdb_assert (! this_cu->is_debug_types);
3000 /* Nor type unit groups. */
3001 gdb_assert (! IS_TYPE_UNIT_GROUP (this_cu));
3003 if (this_cu->v.quick->file_names != NULL)
3004 return this_cu->v.quick->file_names;
3005 /* If we know there is no line data, no point in looking again. */
3006 if (this_cu->v.quick->no_file_data)
3009 init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL);
3011 if (this_cu->v.quick->no_file_data)
3013 return this_cu->v.quick->file_names;
3016 /* A helper for the "quick" functions which computes and caches the
3017 real path for a given file name from the line table. */
3020 dw2_get_real_path (struct objfile *objfile,
3021 struct quick_file_names *qfn, int index)
3023 if (qfn->real_names == NULL)
3024 qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack,
3025 qfn->num_file_names, sizeof (char *));
3027 if (qfn->real_names[index] == NULL)
3028 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]);
3030 return qfn->real_names[index];
3033 static struct symtab *
3034 dw2_find_last_source_symtab (struct objfile *objfile)
3038 dw2_setup (objfile);
3039 index = dwarf2_per_objfile->n_comp_units - 1;
3040 return dw2_instantiate_symtab (dw2_get_cu (index));
3043 /* Traversal function for dw2_forget_cached_source_info. */
3046 dw2_free_cached_file_names (void **slot, void *info)
3048 struct quick_file_names *file_data = (struct quick_file_names *) *slot;
3050 if (file_data->real_names)
3054 for (i = 0; i < file_data->num_file_names; ++i)
3056 xfree ((void*) file_data->real_names[i]);
3057 file_data->real_names[i] = NULL;
3065 dw2_forget_cached_source_info (struct objfile *objfile)
3067 dw2_setup (objfile);
3069 htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table,
3070 dw2_free_cached_file_names, NULL);
3073 /* Helper function for dw2_map_symtabs_matching_filename that expands
3074 the symtabs and calls the iterator. */
3077 dw2_map_expand_apply (struct objfile *objfile,
3078 struct dwarf2_per_cu_data *per_cu,
3079 const char *name, const char *real_path,
3080 int (*callback) (struct symtab *, void *),
3083 struct symtab *last_made = objfile->symtabs;
3085 /* Don't visit already-expanded CUs. */
3086 if (per_cu->v.quick->symtab)
3089 /* This may expand more than one symtab, and we want to iterate over
3091 dw2_instantiate_symtab (per_cu);
3093 return iterate_over_some_symtabs (name, real_path, callback, data,
3094 objfile->symtabs, last_made);
3097 /* Implementation of the map_symtabs_matching_filename method. */
3100 dw2_map_symtabs_matching_filename (struct objfile *objfile, const char *name,
3101 const char *real_path,
3102 int (*callback) (struct symtab *, void *),
3106 const char *name_basename = lbasename (name);
3108 dw2_setup (objfile);
3110 /* The rule is CUs specify all the files, including those used by
3111 any TU, so there's no need to scan TUs here. */
3113 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3116 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
3117 struct quick_file_names *file_data;
3119 /* We only need to look at symtabs not already expanded. */
3120 if (per_cu->v.quick->symtab)
3123 file_data = dw2_get_file_names (per_cu);
3124 if (file_data == NULL)
3127 for (j = 0; j < file_data->num_file_names; ++j)
3129 const char *this_name = file_data->file_names[j];
3130 const char *this_real_name;
3132 if (compare_filenames_for_search (this_name, name))
3134 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3140 /* Before we invoke realpath, which can get expensive when many
3141 files are involved, do a quick comparison of the basenames. */
3142 if (! basenames_may_differ
3143 && FILENAME_CMP (lbasename (this_name), name_basename) != 0)
3146 this_real_name = dw2_get_real_path (objfile, file_data, j);
3147 if (compare_filenames_for_search (this_real_name, name))
3149 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3155 if (real_path != NULL)
3157 gdb_assert (IS_ABSOLUTE_PATH (real_path));
3158 gdb_assert (IS_ABSOLUTE_PATH (name));
3159 if (this_real_name != NULL
3160 && FILENAME_CMP (real_path, this_real_name) == 0)
3162 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3174 /* Struct used to manage iterating over all CUs looking for a symbol. */
3176 struct dw2_symtab_iterator
3178 /* The internalized form of .gdb_index. */
3179 struct mapped_index *index;
3180 /* If non-zero, only look for symbols that match BLOCK_INDEX. */
3181 int want_specific_block;
3182 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
3183 Unused if !WANT_SPECIFIC_BLOCK. */
3185 /* The kind of symbol we're looking for. */
3187 /* The list of CUs from the index entry of the symbol,
3188 or NULL if not found. */
3190 /* The next element in VEC to look at. */
3192 /* The number of elements in VEC, or zero if there is no match. */
3196 /* Initialize the index symtab iterator ITER.
3197 If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols
3198 in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
3201 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
3202 struct mapped_index *index,
3203 int want_specific_block,
3208 iter->index = index;
3209 iter->want_specific_block = want_specific_block;
3210 iter->block_index = block_index;
3211 iter->domain = domain;
3214 if (find_slot_in_mapped_hash (index, name, &iter->vec))
3215 iter->length = MAYBE_SWAP (*iter->vec);
3223 /* Return the next matching CU or NULL if there are no more. */
3225 static struct dwarf2_per_cu_data *
3226 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
3228 for ( ; iter->next < iter->length; ++iter->next)
3230 offset_type cu_index_and_attrs =
3231 MAYBE_SWAP (iter->vec[iter->next + 1]);
3232 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3233 struct dwarf2_per_cu_data *per_cu;
3234 int want_static = iter->block_index != GLOBAL_BLOCK;
3235 /* This value is only valid for index versions >= 7. */
3236 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
3237 gdb_index_symbol_kind symbol_kind =
3238 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3239 /* Only check the symbol attributes if they're present.
3240 Indices prior to version 7 don't record them,
3241 and indices >= 7 may elide them for certain symbols
3242 (gold does this). */
3244 (iter->index->version >= 7
3245 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
3247 /* Don't crash on bad data. */
3248 if (cu_index >= (dwarf2_per_objfile->n_comp_units
3249 + dwarf2_per_objfile->n_type_units))
3251 complaint (&symfile_complaints,
3252 _(".gdb_index entry has bad CU index"
3254 objfile_name (dwarf2_per_objfile->objfile));
3258 per_cu = dw2_get_cu (cu_index);
3260 /* Skip if already read in. */
3261 if (per_cu->v.quick->symtab)
3265 && iter->want_specific_block
3266 && want_static != is_static)
3269 /* Only check the symbol's kind if it has one. */
3272 switch (iter->domain)
3275 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
3276 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
3277 /* Some types are also in VAR_DOMAIN. */
3278 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3282 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3286 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
3301 static struct symtab *
3302 dw2_lookup_symbol (struct objfile *objfile, int block_index,
3303 const char *name, domain_enum domain)
3305 struct symtab *stab_best = NULL;
3306 struct mapped_index *index;
3308 dw2_setup (objfile);
3310 index = dwarf2_per_objfile->index_table;
3312 /* index is NULL if OBJF_READNOW. */
3315 struct dw2_symtab_iterator iter;
3316 struct dwarf2_per_cu_data *per_cu;
3318 dw2_symtab_iter_init (&iter, index, 1, block_index, domain, name);
3320 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3322 struct symbol *sym = NULL;
3323 struct symtab *stab = dw2_instantiate_symtab (per_cu);
3325 /* Some caution must be observed with overloaded functions
3326 and methods, since the index will not contain any overload
3327 information (but NAME might contain it). */
3330 struct blockvector *bv = BLOCKVECTOR (stab);
3331 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
3333 sym = lookup_block_symbol (block, name, domain);
3336 if (sym && strcmp_iw (SYMBOL_SEARCH_NAME (sym), name) == 0)
3338 if (!TYPE_IS_OPAQUE (SYMBOL_TYPE (sym)))
3344 /* Keep looking through other CUs. */
3352 dw2_print_stats (struct objfile *objfile)
3354 int i, total, count;
3356 dw2_setup (objfile);
3357 total = dwarf2_per_objfile->n_comp_units + dwarf2_per_objfile->n_type_units;
3359 for (i = 0; i < total; ++i)
3361 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3363 if (!per_cu->v.quick->symtab)
3366 printf_filtered (_(" Number of read CUs: %d\n"), total - count);
3367 printf_filtered (_(" Number of unread CUs: %d\n"), count);
3370 /* This dumps minimal information about the index.
3371 It is called via "mt print objfiles".
3372 One use is to verify .gdb_index has been loaded by the
3373 gdb.dwarf2/gdb-index.exp testcase. */
3376 dw2_dump (struct objfile *objfile)
3378 dw2_setup (objfile);
3379 gdb_assert (dwarf2_per_objfile->using_index);
3380 printf_filtered (".gdb_index:");
3381 if (dwarf2_per_objfile->index_table != NULL)
3383 printf_filtered (" version %d\n",
3384 dwarf2_per_objfile->index_table->version);
3387 printf_filtered (" faked for \"readnow\"\n");
3388 printf_filtered ("\n");
3392 dw2_relocate (struct objfile *objfile,
3393 const struct section_offsets *new_offsets,
3394 const struct section_offsets *delta)
3396 /* There's nothing to relocate here. */
3400 dw2_expand_symtabs_for_function (struct objfile *objfile,
3401 const char *func_name)
3403 struct mapped_index *index;
3405 dw2_setup (objfile);
3407 index = dwarf2_per_objfile->index_table;
3409 /* index is NULL if OBJF_READNOW. */
3412 struct dw2_symtab_iterator iter;
3413 struct dwarf2_per_cu_data *per_cu;
3415 /* Note: It doesn't matter what we pass for block_index here. */
3416 dw2_symtab_iter_init (&iter, index, 0, GLOBAL_BLOCK, VAR_DOMAIN,
3419 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3420 dw2_instantiate_symtab (per_cu);
3425 dw2_expand_all_symtabs (struct objfile *objfile)
3429 dw2_setup (objfile);
3431 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
3432 + dwarf2_per_objfile->n_type_units); ++i)
3434 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3436 dw2_instantiate_symtab (per_cu);
3441 dw2_expand_symtabs_with_fullname (struct objfile *objfile,
3442 const char *fullname)
3446 dw2_setup (objfile);
3448 /* We don't need to consider type units here.
3449 This is only called for examining code, e.g. expand_line_sal.
3450 There can be an order of magnitude (or more) more type units
3451 than comp units, and we avoid them if we can. */
3453 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3456 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3457 struct quick_file_names *file_data;
3459 /* We only need to look at symtabs not already expanded. */
3460 if (per_cu->v.quick->symtab)
3463 file_data = dw2_get_file_names (per_cu);
3464 if (file_data == NULL)
3467 for (j = 0; j < file_data->num_file_names; ++j)
3469 const char *this_fullname = file_data->file_names[j];
3471 if (filename_cmp (this_fullname, fullname) == 0)
3473 dw2_instantiate_symtab (per_cu);
3481 dw2_map_matching_symbols (const char * name, domain_enum namespace,
3482 struct objfile *objfile, int global,
3483 int (*callback) (struct block *,
3484 struct symbol *, void *),
3485 void *data, symbol_compare_ftype *match,
3486 symbol_compare_ftype *ordered_compare)
3488 /* Currently unimplemented; used for Ada. The function can be called if the
3489 current language is Ada for a non-Ada objfile using GNU index. As Ada
3490 does not look for non-Ada symbols this function should just return. */
3494 dw2_expand_symtabs_matching
3495 (struct objfile *objfile,
3496 int (*file_matcher) (const char *, void *, int basenames),
3497 int (*name_matcher) (const char *, void *),
3498 enum search_domain kind,
3503 struct mapped_index *index;
3505 dw2_setup (objfile);
3507 /* index_table is NULL if OBJF_READNOW. */
3508 if (!dwarf2_per_objfile->index_table)
3510 index = dwarf2_per_objfile->index_table;
3512 if (file_matcher != NULL)
3514 struct cleanup *cleanup;
3515 htab_t visited_found, visited_not_found;
3517 visited_found = htab_create_alloc (10,
3518 htab_hash_pointer, htab_eq_pointer,
3519 NULL, xcalloc, xfree);
3520 cleanup = make_cleanup_htab_delete (visited_found);
3521 visited_not_found = htab_create_alloc (10,
3522 htab_hash_pointer, htab_eq_pointer,
3523 NULL, xcalloc, xfree);
3524 make_cleanup_htab_delete (visited_not_found);
3526 /* The rule is CUs specify all the files, including those used by
3527 any TU, so there's no need to scan TUs here. */
3529 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3532 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
3533 struct quick_file_names *file_data;
3536 per_cu->v.quick->mark = 0;
3538 /* We only need to look at symtabs not already expanded. */
3539 if (per_cu->v.quick->symtab)
3542 file_data = dw2_get_file_names (per_cu);
3543 if (file_data == NULL)
3546 if (htab_find (visited_not_found, file_data) != NULL)
3548 else if (htab_find (visited_found, file_data) != NULL)
3550 per_cu->v.quick->mark = 1;
3554 for (j = 0; j < file_data->num_file_names; ++j)
3556 const char *this_real_name;
3558 if (file_matcher (file_data->file_names[j], data, 0))
3560 per_cu->v.quick->mark = 1;
3564 /* Before we invoke realpath, which can get expensive when many
3565 files are involved, do a quick comparison of the basenames. */
3566 if (!basenames_may_differ
3567 && !file_matcher (lbasename (file_data->file_names[j]),
3571 this_real_name = dw2_get_real_path (objfile, file_data, j);
3572 if (file_matcher (this_real_name, data, 0))
3574 per_cu->v.quick->mark = 1;
3579 slot = htab_find_slot (per_cu->v.quick->mark
3581 : visited_not_found,
3586 do_cleanups (cleanup);
3589 for (iter = 0; iter < index->symbol_table_slots; ++iter)
3591 offset_type idx = 2 * iter;
3593 offset_type *vec, vec_len, vec_idx;
3595 if (index->symbol_table[idx] == 0 && index->symbol_table[idx + 1] == 0)
3598 name = index->constant_pool + MAYBE_SWAP (index->symbol_table[idx]);
3600 if (! (*name_matcher) (name, data))
3603 /* The name was matched, now expand corresponding CUs that were
3605 vec = (offset_type *) (index->constant_pool
3606 + MAYBE_SWAP (index->symbol_table[idx + 1]));
3607 vec_len = MAYBE_SWAP (vec[0]);
3608 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
3610 struct dwarf2_per_cu_data *per_cu;
3611 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]);
3612 gdb_index_symbol_kind symbol_kind =
3613 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3614 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3615 /* Only check the symbol attributes if they're present.
3616 Indices prior to version 7 don't record them,
3617 and indices >= 7 may elide them for certain symbols
3618 (gold does this). */
3620 (index->version >= 7
3621 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
3623 /* Only check the symbol's kind if it has one. */
3628 case VARIABLES_DOMAIN:
3629 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
3632 case FUNCTIONS_DOMAIN:
3633 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
3637 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3645 /* Don't crash on bad data. */
3646 if (cu_index >= (dwarf2_per_objfile->n_comp_units
3647 + dwarf2_per_objfile->n_type_units))
3649 complaint (&symfile_complaints,
3650 _(".gdb_index entry has bad CU index"
3651 " [in module %s]"), objfile_name (objfile));
3655 per_cu = dw2_get_cu (cu_index);
3656 if (file_matcher == NULL || per_cu->v.quick->mark)
3657 dw2_instantiate_symtab (per_cu);
3662 /* A helper for dw2_find_pc_sect_symtab which finds the most specific
3665 static struct symtab *
3666 recursively_find_pc_sect_symtab (struct symtab *symtab, CORE_ADDR pc)
3670 if (BLOCKVECTOR (symtab) != NULL
3671 && blockvector_contains_pc (BLOCKVECTOR (symtab), pc))
3674 if (symtab->includes == NULL)
3677 for (i = 0; symtab->includes[i]; ++i)
3679 struct symtab *s = symtab->includes[i];
3681 s = recursively_find_pc_sect_symtab (s, pc);
3689 static struct symtab *
3690 dw2_find_pc_sect_symtab (struct objfile *objfile,
3691 struct minimal_symbol *msymbol,
3693 struct obj_section *section,
3696 struct dwarf2_per_cu_data *data;
3697 struct symtab *result;
3699 dw2_setup (objfile);
3701 if (!objfile->psymtabs_addrmap)
3704 data = addrmap_find (objfile->psymtabs_addrmap, pc);
3708 if (warn_if_readin && data->v.quick->symtab)
3709 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"),
3710 paddress (get_objfile_arch (objfile), pc));
3712 result = recursively_find_pc_sect_symtab (dw2_instantiate_symtab (data), pc);
3713 gdb_assert (result != NULL);
3718 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun,
3719 void *data, int need_fullname)
3722 struct cleanup *cleanup;
3723 htab_t visited = htab_create_alloc (10, htab_hash_pointer, htab_eq_pointer,
3724 NULL, xcalloc, xfree);
3726 cleanup = make_cleanup_htab_delete (visited);
3727 dw2_setup (objfile);
3729 /* The rule is CUs specify all the files, including those used by
3730 any TU, so there's no need to scan TUs here.
3731 We can ignore file names coming from already-expanded CUs. */
3733 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3735 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3737 if (per_cu->v.quick->symtab)
3739 void **slot = htab_find_slot (visited, per_cu->v.quick->file_names,
3742 *slot = per_cu->v.quick->file_names;
3746 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3749 struct dwarf2_per_cu_data *per_cu = dw2_get_primary_cu (i);
3750 struct quick_file_names *file_data;
3753 /* We only need to look at symtabs not already expanded. */
3754 if (per_cu->v.quick->symtab)
3757 file_data = dw2_get_file_names (per_cu);
3758 if (file_data == NULL)
3761 slot = htab_find_slot (visited, file_data, INSERT);
3764 /* Already visited. */
3769 for (j = 0; j < file_data->num_file_names; ++j)
3771 const char *this_real_name;
3774 this_real_name = dw2_get_real_path (objfile, file_data, j);
3776 this_real_name = NULL;
3777 (*fun) (file_data->file_names[j], this_real_name, data);
3781 do_cleanups (cleanup);
3785 dw2_has_symbols (struct objfile *objfile)
3790 const struct quick_symbol_functions dwarf2_gdb_index_functions =
3793 dw2_find_last_source_symtab,
3794 dw2_forget_cached_source_info,
3795 dw2_map_symtabs_matching_filename,
3800 dw2_expand_symtabs_for_function,
3801 dw2_expand_all_symtabs,
3802 dw2_expand_symtabs_with_fullname,
3803 dw2_map_matching_symbols,
3804 dw2_expand_symtabs_matching,
3805 dw2_find_pc_sect_symtab,
3806 dw2_map_symbol_filenames
3809 /* Initialize for reading DWARF for this objfile. Return 0 if this
3810 file will use psymtabs, or 1 if using the GNU index. */
3813 dwarf2_initialize_objfile (struct objfile *objfile)
3815 /* If we're about to read full symbols, don't bother with the
3816 indices. In this case we also don't care if some other debug
3817 format is making psymtabs, because they are all about to be
3819 if ((objfile->flags & OBJF_READNOW))
3823 dwarf2_per_objfile->using_index = 1;
3824 create_all_comp_units (objfile);
3825 create_all_type_units (objfile);
3826 dwarf2_per_objfile->quick_file_names_table =
3827 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
3829 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
3830 + dwarf2_per_objfile->n_type_units); ++i)
3832 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3834 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3835 struct dwarf2_per_cu_quick_data);
3838 /* Return 1 so that gdb sees the "quick" functions. However,
3839 these functions will be no-ops because we will have expanded
3844 if (dwarf2_read_index (objfile))
3852 /* Build a partial symbol table. */
3855 dwarf2_build_psymtabs (struct objfile *objfile)
3857 volatile struct gdb_exception except;
3859 if (objfile->global_psymbols.size == 0 && objfile->static_psymbols.size == 0)
3861 init_psymbol_list (objfile, 1024);
3864 TRY_CATCH (except, RETURN_MASK_ERROR)
3866 /* This isn't really ideal: all the data we allocate on the
3867 objfile's obstack is still uselessly kept around. However,
3868 freeing it seems unsafe. */
3869 struct cleanup *cleanups = make_cleanup_discard_psymtabs (objfile);
3871 dwarf2_build_psymtabs_hard (objfile);
3872 discard_cleanups (cleanups);
3874 if (except.reason < 0)
3875 exception_print (gdb_stderr, except);
3878 /* Return the total length of the CU described by HEADER. */
3881 get_cu_length (const struct comp_unit_head *header)
3883 return header->initial_length_size + header->length;
3886 /* Return TRUE if OFFSET is within CU_HEADER. */
3889 offset_in_cu_p (const struct comp_unit_head *cu_header, sect_offset offset)
3891 sect_offset bottom = { cu_header->offset.sect_off };
3892 sect_offset top = { cu_header->offset.sect_off + get_cu_length (cu_header) };
3894 return (offset.sect_off >= bottom.sect_off && offset.sect_off < top.sect_off);
3897 /* Find the base address of the compilation unit for range lists and
3898 location lists. It will normally be specified by DW_AT_low_pc.
3899 In DWARF-3 draft 4, the base address could be overridden by
3900 DW_AT_entry_pc. It's been removed, but GCC still uses this for
3901 compilation units with discontinuous ranges. */
3904 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu)
3906 struct attribute *attr;
3909 cu->base_address = 0;
3911 attr = dwarf2_attr (die, DW_AT_entry_pc, cu);
3914 cu->base_address = DW_ADDR (attr);
3919 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
3922 cu->base_address = DW_ADDR (attr);
3928 /* Read in the comp unit header information from the debug_info at info_ptr.
3929 NOTE: This leaves members offset, first_die_offset to be filled in
3932 static const gdb_byte *
3933 read_comp_unit_head (struct comp_unit_head *cu_header,
3934 const gdb_byte *info_ptr, bfd *abfd)
3937 unsigned int bytes_read;
3939 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read);
3940 cu_header->initial_length_size = bytes_read;
3941 cu_header->offset_size = (bytes_read == 4) ? 4 : 8;
3942 info_ptr += bytes_read;
3943 cu_header->version = read_2_bytes (abfd, info_ptr);
3945 cu_header->abbrev_offset.sect_off = read_offset (abfd, info_ptr, cu_header,
3947 info_ptr += bytes_read;
3948 cu_header->addr_size = read_1_byte (abfd, info_ptr);
3950 signed_addr = bfd_get_sign_extend_vma (abfd);
3951 if (signed_addr < 0)
3952 internal_error (__FILE__, __LINE__,
3953 _("read_comp_unit_head: dwarf from non elf file"));
3954 cu_header->signed_addr_p = signed_addr;
3959 /* Helper function that returns the proper abbrev section for
3962 static struct dwarf2_section_info *
3963 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu)
3965 struct dwarf2_section_info *abbrev;
3967 if (this_cu->is_dwz)
3968 abbrev = &dwarf2_get_dwz_file ()->abbrev;
3970 abbrev = &dwarf2_per_objfile->abbrev;
3975 /* Subroutine of read_and_check_comp_unit_head and
3976 read_and_check_type_unit_head to simplify them.
3977 Perform various error checking on the header. */
3980 error_check_comp_unit_head (struct comp_unit_head *header,
3981 struct dwarf2_section_info *section,
3982 struct dwarf2_section_info *abbrev_section)
3984 bfd *abfd = section->asection->owner;
3985 const char *filename = bfd_get_filename (abfd);
3987 if (header->version != 2 && header->version != 3 && header->version != 4)
3988 error (_("Dwarf Error: wrong version in compilation unit header "
3989 "(is %d, should be 2, 3, or 4) [in module %s]"), header->version,
3992 if (header->abbrev_offset.sect_off
3993 >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section))
3994 error (_("Dwarf Error: bad offset (0x%lx) in compilation unit header "
3995 "(offset 0x%lx + 6) [in module %s]"),
3996 (long) header->abbrev_offset.sect_off, (long) header->offset.sect_off,
3999 /* Cast to unsigned long to use 64-bit arithmetic when possible to
4000 avoid potential 32-bit overflow. */
4001 if (((unsigned long) header->offset.sect_off + get_cu_length (header))
4003 error (_("Dwarf Error: bad length (0x%lx) in compilation unit header "
4004 "(offset 0x%lx + 0) [in module %s]"),
4005 (long) header->length, (long) header->offset.sect_off,
4009 /* Read in a CU/TU header and perform some basic error checking.
4010 The contents of the header are stored in HEADER.
4011 The result is a pointer to the start of the first DIE. */
4013 static const gdb_byte *
4014 read_and_check_comp_unit_head (struct comp_unit_head *header,
4015 struct dwarf2_section_info *section,
4016 struct dwarf2_section_info *abbrev_section,
4017 const gdb_byte *info_ptr,
4018 int is_debug_types_section)
4020 const gdb_byte *beg_of_comp_unit = info_ptr;
4021 bfd *abfd = section->asection->owner;
4023 header->offset.sect_off = beg_of_comp_unit - section->buffer;
4025 info_ptr = read_comp_unit_head (header, info_ptr, abfd);
4027 /* If we're reading a type unit, skip over the signature and
4028 type_offset fields. */
4029 if (is_debug_types_section)
4030 info_ptr += 8 /*signature*/ + header->offset_size;
4032 header->first_die_offset.cu_off = info_ptr - beg_of_comp_unit;
4034 error_check_comp_unit_head (header, section, abbrev_section);
4039 /* Read in the types comp unit header information from .debug_types entry at
4040 types_ptr. The result is a pointer to one past the end of the header. */
4042 static const gdb_byte *
4043 read_and_check_type_unit_head (struct comp_unit_head *header,
4044 struct dwarf2_section_info *section,
4045 struct dwarf2_section_info *abbrev_section,
4046 const gdb_byte *info_ptr,
4047 ULONGEST *signature,
4048 cu_offset *type_offset_in_tu)
4050 const gdb_byte *beg_of_comp_unit = info_ptr;
4051 bfd *abfd = section->asection->owner;
4053 header->offset.sect_off = beg_of_comp_unit - section->buffer;
4055 info_ptr = read_comp_unit_head (header, info_ptr, abfd);
4057 /* If we're reading a type unit, skip over the signature and
4058 type_offset fields. */
4059 if (signature != NULL)
4060 *signature = read_8_bytes (abfd, info_ptr);
4062 if (type_offset_in_tu != NULL)
4063 type_offset_in_tu->cu_off = read_offset_1 (abfd, info_ptr,
4064 header->offset_size);
4065 info_ptr += header->offset_size;
4067 header->first_die_offset.cu_off = info_ptr - beg_of_comp_unit;
4069 error_check_comp_unit_head (header, section, abbrev_section);
4074 /* Fetch the abbreviation table offset from a comp or type unit header. */
4077 read_abbrev_offset (struct dwarf2_section_info *section,
4080 bfd *abfd = section->asection->owner;
4081 const gdb_byte *info_ptr;
4082 unsigned int length, initial_length_size, offset_size;
4083 sect_offset abbrev_offset;
4085 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
4086 info_ptr = section->buffer + offset.sect_off;
4087 length = read_initial_length (abfd, info_ptr, &initial_length_size);
4088 offset_size = initial_length_size == 4 ? 4 : 8;
4089 info_ptr += initial_length_size + 2 /*version*/;
4090 abbrev_offset.sect_off = read_offset_1 (abfd, info_ptr, offset_size);
4091 return abbrev_offset;
4094 /* Allocate a new partial symtab for file named NAME and mark this new
4095 partial symtab as being an include of PST. */
4098 dwarf2_create_include_psymtab (const char *name, struct partial_symtab *pst,
4099 struct objfile *objfile)
4101 struct partial_symtab *subpst = allocate_psymtab (name, objfile);
4103 if (!IS_ABSOLUTE_PATH (subpst->filename))
4105 /* It shares objfile->objfile_obstack. */
4106 subpst->dirname = pst->dirname;
4109 subpst->section_offsets = pst->section_offsets;
4110 subpst->textlow = 0;
4111 subpst->texthigh = 0;
4113 subpst->dependencies = (struct partial_symtab **)
4114 obstack_alloc (&objfile->objfile_obstack,
4115 sizeof (struct partial_symtab *));
4116 subpst->dependencies[0] = pst;
4117 subpst->number_of_dependencies = 1;
4119 subpst->globals_offset = 0;
4120 subpst->n_global_syms = 0;
4121 subpst->statics_offset = 0;
4122 subpst->n_static_syms = 0;
4123 subpst->symtab = NULL;
4124 subpst->read_symtab = pst->read_symtab;
4127 /* No private part is necessary for include psymtabs. This property
4128 can be used to differentiate between such include psymtabs and
4129 the regular ones. */
4130 subpst->read_symtab_private = NULL;
4133 /* Read the Line Number Program data and extract the list of files
4134 included by the source file represented by PST. Build an include
4135 partial symtab for each of these included files. */
4138 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu,
4139 struct die_info *die,
4140 struct partial_symtab *pst)
4142 struct line_header *lh = NULL;
4143 struct attribute *attr;
4145 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
4147 lh = dwarf_decode_line_header (DW_UNSND (attr), cu);
4149 return; /* No linetable, so no includes. */
4151 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). */
4152 dwarf_decode_lines (lh, pst->dirname, cu, pst, 1);
4154 free_line_header (lh);
4158 hash_signatured_type (const void *item)
4160 const struct signatured_type *sig_type = item;
4162 /* This drops the top 32 bits of the signature, but is ok for a hash. */
4163 return sig_type->signature;
4167 eq_signatured_type (const void *item_lhs, const void *item_rhs)
4169 const struct signatured_type *lhs = item_lhs;
4170 const struct signatured_type *rhs = item_rhs;
4172 return lhs->signature == rhs->signature;
4175 /* Allocate a hash table for signatured types. */
4178 allocate_signatured_type_table (struct objfile *objfile)
4180 return htab_create_alloc_ex (41,
4181 hash_signatured_type,
4184 &objfile->objfile_obstack,
4185 hashtab_obstack_allocate,
4186 dummy_obstack_deallocate);
4189 /* A helper function to add a signatured type CU to a table. */
4192 add_signatured_type_cu_to_table (void **slot, void *datum)
4194 struct signatured_type *sigt = *slot;
4195 struct signatured_type ***datap = datum;
4203 /* Create the hash table of all entries in the .debug_types
4204 (or .debug_types.dwo) section(s).
4205 If reading a DWO file, then DWO_FILE is a pointer to the DWO file object,
4206 otherwise it is NULL.
4208 The result is a pointer to the hash table or NULL if there are no types.
4210 Note: This function processes DWO files only, not DWP files. */
4213 create_debug_types_hash_table (struct dwo_file *dwo_file,
4214 VEC (dwarf2_section_info_def) *types)
4216 struct objfile *objfile = dwarf2_per_objfile->objfile;
4217 htab_t types_htab = NULL;
4219 struct dwarf2_section_info *section;
4220 struct dwarf2_section_info *abbrev_section;
4222 if (VEC_empty (dwarf2_section_info_def, types))
4225 abbrev_section = (dwo_file != NULL
4226 ? &dwo_file->sections.abbrev
4227 : &dwarf2_per_objfile->abbrev);
4229 if (dwarf2_read_debug)
4230 fprintf_unfiltered (gdb_stdlog, "Reading .debug_types%s for %s:\n",
4231 dwo_file ? ".dwo" : "",
4232 bfd_get_filename (abbrev_section->asection->owner));
4235 VEC_iterate (dwarf2_section_info_def, types, ix, section);
4239 const gdb_byte *info_ptr, *end_ptr;
4240 struct dwarf2_section_info *abbrev_section;
4242 dwarf2_read_section (objfile, section);
4243 info_ptr = section->buffer;
4245 if (info_ptr == NULL)
4248 /* We can't set abfd until now because the section may be empty or
4249 not present, in which case section->asection will be NULL. */
4250 abfd = section->asection->owner;
4253 abbrev_section = &dwo_file->sections.abbrev;
4255 abbrev_section = &dwarf2_per_objfile->abbrev;
4257 /* We don't use init_cutu_and_read_dies_simple, or some such, here
4258 because we don't need to read any dies: the signature is in the
4261 end_ptr = info_ptr + section->size;
4262 while (info_ptr < end_ptr)
4265 cu_offset type_offset_in_tu;
4267 struct signatured_type *sig_type;
4268 struct dwo_unit *dwo_tu;
4270 const gdb_byte *ptr = info_ptr;
4271 struct comp_unit_head header;
4272 unsigned int length;
4274 offset.sect_off = ptr - section->buffer;
4276 /* We need to read the type's signature in order to build the hash
4277 table, but we don't need anything else just yet. */
4279 ptr = read_and_check_type_unit_head (&header, section,
4280 abbrev_section, ptr,
4281 &signature, &type_offset_in_tu);
4283 length = get_cu_length (&header);
4285 /* Skip dummy type units. */
4286 if (ptr >= info_ptr + length
4287 || peek_abbrev_code (abfd, ptr) == 0)
4293 if (types_htab == NULL)
4296 types_htab = allocate_dwo_unit_table (objfile);
4298 types_htab = allocate_signatured_type_table (objfile);
4304 dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4306 dwo_tu->dwo_file = dwo_file;
4307 dwo_tu->signature = signature;
4308 dwo_tu->type_offset_in_tu = type_offset_in_tu;
4309 dwo_tu->section = section;
4310 dwo_tu->offset = offset;
4311 dwo_tu->length = length;
4315 /* N.B.: type_offset is not usable if this type uses a DWO file.
4316 The real type_offset is in the DWO file. */
4318 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4319 struct signatured_type);
4320 sig_type->signature = signature;
4321 sig_type->type_offset_in_tu = type_offset_in_tu;
4322 sig_type->per_cu.objfile = objfile;
4323 sig_type->per_cu.is_debug_types = 1;
4324 sig_type->per_cu.section = section;
4325 sig_type->per_cu.offset = offset;
4326 sig_type->per_cu.length = length;
4329 slot = htab_find_slot (types_htab,
4330 dwo_file ? (void*) dwo_tu : (void *) sig_type,
4332 gdb_assert (slot != NULL);
4335 sect_offset dup_offset;
4339 const struct dwo_unit *dup_tu = *slot;
4341 dup_offset = dup_tu->offset;
4345 const struct signatured_type *dup_tu = *slot;
4347 dup_offset = dup_tu->per_cu.offset;
4350 complaint (&symfile_complaints,
4351 _("debug type entry at offset 0x%x is duplicate to"
4352 " the entry at offset 0x%x, signature %s"),
4353 offset.sect_off, dup_offset.sect_off,
4354 hex_string (signature));
4356 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type;
4358 if (dwarf2_read_debug)
4359 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, signature %s\n",
4361 hex_string (signature));
4370 /* Create the hash table of all entries in the .debug_types section,
4371 and initialize all_type_units.
4372 The result is zero if there is an error (e.g. missing .debug_types section),
4373 otherwise non-zero. */
4376 create_all_type_units (struct objfile *objfile)
4379 struct signatured_type **iter;
4381 types_htab = create_debug_types_hash_table (NULL, dwarf2_per_objfile->types);
4382 if (types_htab == NULL)
4384 dwarf2_per_objfile->signatured_types = NULL;
4388 dwarf2_per_objfile->signatured_types = types_htab;
4390 dwarf2_per_objfile->n_type_units = htab_elements (types_htab);
4391 dwarf2_per_objfile->all_type_units
4392 = xmalloc (dwarf2_per_objfile->n_type_units
4393 * sizeof (struct signatured_type *));
4394 iter = &dwarf2_per_objfile->all_type_units[0];
4395 htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table, &iter);
4396 gdb_assert (iter - &dwarf2_per_objfile->all_type_units[0]
4397 == dwarf2_per_objfile->n_type_units);
4402 /* Subroutine of lookup_dwo_signatured_type and lookup_dwp_signatured_type.
4403 Fill in SIG_ENTRY with DWO_ENTRY. */
4406 fill_in_sig_entry_from_dwo_entry (struct objfile *objfile,
4407 struct signatured_type *sig_entry,
4408 struct dwo_unit *dwo_entry)
4410 /* Make sure we're not clobbering something we don't expect to. */
4411 gdb_assert (! sig_entry->per_cu.queued);
4412 gdb_assert (sig_entry->per_cu.cu == NULL);
4413 gdb_assert (sig_entry->per_cu.v.quick != NULL);
4414 gdb_assert (sig_entry->per_cu.v.quick->symtab == NULL);
4415 gdb_assert (sig_entry->signature == dwo_entry->signature);
4416 gdb_assert (sig_entry->type_offset_in_section.sect_off == 0);
4417 gdb_assert (sig_entry->type_unit_group == NULL);
4418 gdb_assert (sig_entry->dwo_unit == NULL);
4420 sig_entry->per_cu.section = dwo_entry->section;
4421 sig_entry->per_cu.offset = dwo_entry->offset;
4422 sig_entry->per_cu.length = dwo_entry->length;
4423 sig_entry->per_cu.reading_dwo_directly = 1;
4424 sig_entry->per_cu.objfile = objfile;
4425 sig_entry->type_offset_in_tu = dwo_entry->type_offset_in_tu;
4426 sig_entry->dwo_unit = dwo_entry;
4429 /* Subroutine of lookup_signatured_type.
4430 If we haven't read the TU yet, create the signatured_type data structure
4431 for a TU to be read in directly from a DWO file, bypassing the stub.
4432 This is the "Stay in DWO Optimization": When there is no DWP file and we're
4433 using .gdb_index, then when reading a CU we want to stay in the DWO file
4434 containing that CU. Otherwise we could end up reading several other DWO
4435 files (due to comdat folding) to process the transitive closure of all the
4436 mentioned TUs, and that can be slow. The current DWO file will have every
4437 type signature that it needs.
4438 We only do this for .gdb_index because in the psymtab case we already have
4439 to read all the DWOs to build the type unit groups. */
4441 static struct signatured_type *
4442 lookup_dwo_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
4444 struct objfile *objfile = dwarf2_per_objfile->objfile;
4445 struct dwo_file *dwo_file;
4446 struct dwo_unit find_dwo_entry, *dwo_entry;
4447 struct signatured_type find_sig_entry, *sig_entry;
4449 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
4451 /* Note: cu->dwo_unit is the dwo_unit that references this TU, not the
4452 dwo_unit of the TU itself. */
4453 dwo_file = cu->dwo_unit->dwo_file;
4455 /* We only ever need to read in one copy of a signatured type.
4456 Just use the global signatured_types array. If this is the first time
4457 we're reading this type, replace the recorded data from .gdb_index with
4460 if (dwarf2_per_objfile->signatured_types == NULL)
4462 find_sig_entry.signature = sig;
4463 sig_entry = htab_find (dwarf2_per_objfile->signatured_types, &find_sig_entry);
4464 if (sig_entry == NULL)
4467 /* We can get here with the TU already read, *or* in the process of being
4468 read. Don't reassign it if that's the case. Also note that if the TU is
4469 already being read, it may not have come from a DWO, the program may be
4470 a mix of Fission-compiled code and non-Fission-compiled code. */
4471 /* Have we already tried to read this TU? */
4472 if (sig_entry->per_cu.tu_read)
4475 /* Ok, this is the first time we're reading this TU. */
4476 if (dwo_file->tus == NULL)
4478 find_dwo_entry.signature = sig;
4479 dwo_entry = htab_find (dwo_file->tus, &find_dwo_entry);
4480 if (dwo_entry == NULL)
4483 fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry);
4484 sig_entry->per_cu.tu_read = 1;
4488 /* Subroutine of lookup_dwp_signatured_type.
4489 Add an entry for signature SIG to dwarf2_per_objfile->signatured_types. */
4491 static struct signatured_type *
4492 add_type_unit (ULONGEST sig)
4494 struct objfile *objfile = dwarf2_per_objfile->objfile;
4495 int n_type_units = dwarf2_per_objfile->n_type_units;
4496 struct signatured_type *sig_type;
4500 dwarf2_per_objfile->all_type_units =
4501 xrealloc (dwarf2_per_objfile->all_type_units,
4502 n_type_units * sizeof (struct signatured_type *));
4503 dwarf2_per_objfile->n_type_units = n_type_units;
4504 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
4505 struct signatured_type);
4506 dwarf2_per_objfile->all_type_units[n_type_units - 1] = sig_type;
4507 sig_type->signature = sig;
4508 sig_type->per_cu.is_debug_types = 1;
4509 sig_type->per_cu.v.quick =
4510 OBSTACK_ZALLOC (&objfile->objfile_obstack,
4511 struct dwarf2_per_cu_quick_data);
4512 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
4514 gdb_assert (*slot == NULL);
4516 /* The rest of sig_type must be filled in by the caller. */
4520 /* Subroutine of lookup_signatured_type.
4521 Look up the type for signature SIG, and if we can't find SIG in .gdb_index
4522 then try the DWP file.
4523 Normally this "can't happen", but if there's a bug in signature
4524 generation and/or the DWP file is built incorrectly, it can happen.
4525 Using the type directly from the DWP file means we don't have the stub
4526 which has some useful attributes (e.g., DW_AT_comp_dir), but they're
4527 not critical. [Eventually the stub may go away for type units anyway.] */
4529 static struct signatured_type *
4530 lookup_dwp_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
4532 struct objfile *objfile = dwarf2_per_objfile->objfile;
4533 struct dwp_file *dwp_file = get_dwp_file ();
4534 struct dwo_unit *dwo_entry;
4535 struct signatured_type find_sig_entry, *sig_entry;
4537 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
4538 gdb_assert (dwp_file != NULL);
4540 if (dwarf2_per_objfile->signatured_types != NULL)
4542 find_sig_entry.signature = sig;
4543 sig_entry = htab_find (dwarf2_per_objfile->signatured_types,
4545 if (sig_entry != NULL)
4549 /* This is the "shouldn't happen" case.
4550 Try the DWP file and hope for the best. */
4551 if (dwp_file->tus == NULL)
4553 dwo_entry = lookup_dwo_in_dwp (dwp_file, dwp_file->tus, NULL,
4554 sig, 1 /* is_debug_types */);
4555 if (dwo_entry == NULL)
4558 sig_entry = add_type_unit (sig);
4559 fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry);
4561 /* The caller will signal a complaint if we return NULL.
4562 Here we don't return NULL but we still want to complain. */
4563 complaint (&symfile_complaints,
4564 _("Bad type signature %s referenced by %s at 0x%x,"
4565 " coping by using copy in DWP [in module %s]"),
4567 cu->per_cu->is_debug_types ? "TU" : "CU",
4568 cu->per_cu->offset.sect_off,
4569 objfile_name (objfile));
4574 /* Lookup a signature based type for DW_FORM_ref_sig8.
4575 Returns NULL if signature SIG is not present in the table.
4576 It is up to the caller to complain about this. */
4578 static struct signatured_type *
4579 lookup_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
4582 && dwarf2_per_objfile->using_index)
4584 /* We're in a DWO/DWP file, and we're using .gdb_index.
4585 These cases require special processing. */
4586 if (get_dwp_file () == NULL)
4587 return lookup_dwo_signatured_type (cu, sig);
4589 return lookup_dwp_signatured_type (cu, sig);
4593 struct signatured_type find_entry, *entry;
4595 if (dwarf2_per_objfile->signatured_types == NULL)
4597 find_entry.signature = sig;
4598 entry = htab_find (dwarf2_per_objfile->signatured_types, &find_entry);
4603 /* Low level DIE reading support. */
4605 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */
4608 init_cu_die_reader (struct die_reader_specs *reader,
4609 struct dwarf2_cu *cu,
4610 struct dwarf2_section_info *section,
4611 struct dwo_file *dwo_file)
4613 gdb_assert (section->readin && section->buffer != NULL);
4614 reader->abfd = section->asection->owner;
4616 reader->dwo_file = dwo_file;
4617 reader->die_section = section;
4618 reader->buffer = section->buffer;
4619 reader->buffer_end = section->buffer + section->size;
4620 reader->comp_dir = NULL;
4623 /* Subroutine of init_cutu_and_read_dies to simplify it.
4624 Read in the rest of a CU/TU top level DIE from DWO_UNIT.
4625 There's just a lot of work to do, and init_cutu_and_read_dies is big enough
4628 STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes
4629 from it to the DIE in the DWO. If NULL we are skipping the stub.
4630 STUB_COMP_DIR is similar to STUB_COMP_UNIT_DIE: When reading a TU directly
4631 from the DWO file, bypassing the stub, it contains the DW_AT_comp_dir
4632 attribute of the referencing CU. Exactly one of STUB_COMP_UNIT_DIE and
4633 COMP_DIR must be non-NULL.
4634 *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE,*RESULT_HAS_CHILDREN
4635 are filled in with the info of the DIE from the DWO file.
4636 ABBREV_TABLE_PROVIDED is non-zero if the caller of init_cutu_and_read_dies
4637 provided an abbrev table to use.
4638 The result is non-zero if a valid (non-dummy) DIE was found. */
4641 read_cutu_die_from_dwo (struct dwarf2_per_cu_data *this_cu,
4642 struct dwo_unit *dwo_unit,
4643 int abbrev_table_provided,
4644 struct die_info *stub_comp_unit_die,
4645 const char *stub_comp_dir,
4646 struct die_reader_specs *result_reader,
4647 const gdb_byte **result_info_ptr,
4648 struct die_info **result_comp_unit_die,
4649 int *result_has_children)
4651 struct objfile *objfile = dwarf2_per_objfile->objfile;
4652 struct dwarf2_cu *cu = this_cu->cu;
4653 struct dwarf2_section_info *section;
4655 const gdb_byte *begin_info_ptr, *info_ptr;
4656 const char *comp_dir_string;
4657 ULONGEST signature; /* Or dwo_id. */
4658 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges;
4659 int i,num_extra_attrs;
4660 struct dwarf2_section_info *dwo_abbrev_section;
4661 struct attribute *attr;
4662 struct attribute comp_dir_attr;
4663 struct die_info *comp_unit_die;
4665 /* Both can't be provided. */
4666 gdb_assert (! (stub_comp_unit_die && stub_comp_dir));
4668 /* These attributes aren't processed until later:
4669 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges.
4670 However, the attribute is found in the stub which we won't have later.
4671 In order to not impose this complication on the rest of the code,
4672 we read them here and copy them to the DWO CU/TU die. */
4680 if (stub_comp_unit_die != NULL)
4682 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
4684 if (! this_cu->is_debug_types)
4685 stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu);
4686 low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu);
4687 high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu);
4688 ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu);
4689 comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu);
4691 /* There should be a DW_AT_addr_base attribute here (if needed).
4692 We need the value before we can process DW_FORM_GNU_addr_index. */
4694 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_addr_base, cu);
4696 cu->addr_base = DW_UNSND (attr);
4698 /* There should be a DW_AT_ranges_base attribute here (if needed).
4699 We need the value before we can process DW_AT_ranges. */
4700 cu->ranges_base = 0;
4701 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_ranges_base, cu);
4703 cu->ranges_base = DW_UNSND (attr);
4705 else if (stub_comp_dir != NULL)
4707 /* Reconstruct the comp_dir attribute to simplify the code below. */
4708 comp_dir = (struct attribute *)
4709 obstack_alloc (&cu->comp_unit_obstack, sizeof (*comp_dir));
4710 comp_dir->name = DW_AT_comp_dir;
4711 comp_dir->form = DW_FORM_string;
4712 DW_STRING_IS_CANONICAL (comp_dir) = 0;
4713 DW_STRING (comp_dir) = stub_comp_dir;
4716 /* Set up for reading the DWO CU/TU. */
4717 cu->dwo_unit = dwo_unit;
4718 section = dwo_unit->section;
4719 dwarf2_read_section (objfile, section);
4720 abfd = section->asection->owner;
4721 begin_info_ptr = info_ptr = section->buffer + dwo_unit->offset.sect_off;
4722 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev;
4723 init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file);
4725 if (this_cu->is_debug_types)
4727 ULONGEST header_signature;
4728 cu_offset type_offset_in_tu;
4729 struct signatured_type *sig_type = (struct signatured_type *) this_cu;
4731 info_ptr = read_and_check_type_unit_head (&cu->header, section,
4735 &type_offset_in_tu);
4736 /* This is not an assert because it can be caused by bad debug info. */
4737 if (sig_type->signature != header_signature)
4739 error (_("Dwarf Error: signature mismatch %s vs %s while reading"
4740 " TU at offset 0x%x [in module %s]"),
4741 hex_string (sig_type->signature),
4742 hex_string (header_signature),
4743 dwo_unit->offset.sect_off,
4744 bfd_get_filename (abfd));
4746 gdb_assert (dwo_unit->offset.sect_off == cu->header.offset.sect_off);
4747 /* For DWOs coming from DWP files, we don't know the CU length
4748 nor the type's offset in the TU until now. */
4749 dwo_unit->length = get_cu_length (&cu->header);
4750 dwo_unit->type_offset_in_tu = type_offset_in_tu;
4752 /* Establish the type offset that can be used to lookup the type.
4753 For DWO files, we don't know it until now. */
4754 sig_type->type_offset_in_section.sect_off =
4755 dwo_unit->offset.sect_off + dwo_unit->type_offset_in_tu.cu_off;
4759 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
4762 gdb_assert (dwo_unit->offset.sect_off == cu->header.offset.sect_off);
4763 /* For DWOs coming from DWP files, we don't know the CU length
4765 dwo_unit->length = get_cu_length (&cu->header);
4768 /* Replace the CU's original abbrev table with the DWO's.
4769 Reminder: We can't read the abbrev table until we've read the header. */
4770 if (abbrev_table_provided)
4772 /* Don't free the provided abbrev table, the caller of
4773 init_cutu_and_read_dies owns it. */
4774 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
4775 /* Ensure the DWO abbrev table gets freed. */
4776 make_cleanup (dwarf2_free_abbrev_table, cu);
4780 dwarf2_free_abbrev_table (cu);
4781 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
4782 /* Leave any existing abbrev table cleanup as is. */
4785 /* Read in the die, but leave space to copy over the attributes
4786 from the stub. This has the benefit of simplifying the rest of
4787 the code - all the work to maintain the illusion of a single
4788 DW_TAG_{compile,type}_unit DIE is done here. */
4789 num_extra_attrs = ((stmt_list != NULL)
4793 + (comp_dir != NULL));
4794 info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr,
4795 result_has_children, num_extra_attrs);
4797 /* Copy over the attributes from the stub to the DIE we just read in. */
4798 comp_unit_die = *result_comp_unit_die;
4799 i = comp_unit_die->num_attrs;
4800 if (stmt_list != NULL)
4801 comp_unit_die->attrs[i++] = *stmt_list;
4803 comp_unit_die->attrs[i++] = *low_pc;
4804 if (high_pc != NULL)
4805 comp_unit_die->attrs[i++] = *high_pc;
4807 comp_unit_die->attrs[i++] = *ranges;
4808 if (comp_dir != NULL)
4809 comp_unit_die->attrs[i++] = *comp_dir;
4810 comp_unit_die->num_attrs += num_extra_attrs;
4812 if (dwarf2_die_debug)
4814 fprintf_unfiltered (gdb_stdlog,
4815 "Read die from %s@0x%x of %s:\n",
4816 bfd_section_name (abfd, section->asection),
4817 (unsigned) (begin_info_ptr - section->buffer),
4818 bfd_get_filename (abfd));
4819 dump_die (comp_unit_die, dwarf2_die_debug);
4822 /* Save the comp_dir attribute. If there is no DWP file then we'll read
4823 TUs by skipping the stub and going directly to the entry in the DWO file.
4824 However, skipping the stub means we won't get DW_AT_comp_dir, so we have
4825 to get it via circuitous means. Blech. */
4826 if (comp_dir != NULL)
4827 result_reader->comp_dir = DW_STRING (comp_dir);
4829 /* Skip dummy compilation units. */
4830 if (info_ptr >= begin_info_ptr + dwo_unit->length
4831 || peek_abbrev_code (abfd, info_ptr) == 0)
4834 *result_info_ptr = info_ptr;
4838 /* Subroutine of init_cutu_and_read_dies to simplify it.
4839 Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU.
4840 Returns NULL if the specified DWO unit cannot be found. */
4842 static struct dwo_unit *
4843 lookup_dwo_unit (struct dwarf2_per_cu_data *this_cu,
4844 struct die_info *comp_unit_die)
4846 struct dwarf2_cu *cu = this_cu->cu;
4847 struct attribute *attr;
4849 struct dwo_unit *dwo_unit;
4850 const char *comp_dir, *dwo_name;
4852 gdb_assert (cu != NULL);
4854 /* Yeah, we look dwo_name up again, but it simplifies the code. */
4855 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
4856 gdb_assert (attr != NULL);
4857 dwo_name = DW_STRING (attr);
4859 attr = dwarf2_attr (comp_unit_die, DW_AT_comp_dir, cu);
4861 comp_dir = DW_STRING (attr);
4863 if (this_cu->is_debug_types)
4865 struct signatured_type *sig_type;
4867 /* Since this_cu is the first member of struct signatured_type,
4868 we can go from a pointer to one to a pointer to the other. */
4869 sig_type = (struct signatured_type *) this_cu;
4870 signature = sig_type->signature;
4871 dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir);
4875 struct attribute *attr;
4877 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
4879 error (_("Dwarf Error: missing dwo_id for dwo_name %s"
4881 dwo_name, objfile_name (this_cu->objfile));
4882 signature = DW_UNSND (attr);
4883 dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir,
4890 /* Subroutine of init_cutu_and_read_dies to simplify it.
4891 Read a TU directly from a DWO file, bypassing the stub. */
4894 init_tu_and_read_dwo_dies (struct dwarf2_per_cu_data *this_cu, int keep,
4895 die_reader_func_ftype *die_reader_func,
4898 struct dwarf2_cu *cu;
4899 struct signatured_type *sig_type;
4900 struct cleanup *cleanups, *free_cu_cleanup;
4901 struct die_reader_specs reader;
4902 const gdb_byte *info_ptr;
4903 struct die_info *comp_unit_die;
4906 /* Verify we can do the following downcast, and that we have the
4908 gdb_assert (this_cu->is_debug_types && this_cu->reading_dwo_directly);
4909 sig_type = (struct signatured_type *) this_cu;
4910 gdb_assert (sig_type->dwo_unit != NULL);
4912 cleanups = make_cleanup (null_cleanup, NULL);
4914 gdb_assert (this_cu->cu == NULL);
4915 cu = xmalloc (sizeof (*cu));
4916 init_one_comp_unit (cu, this_cu);
4917 /* If an error occurs while loading, release our storage. */
4918 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
4920 if (read_cutu_die_from_dwo (this_cu, sig_type->dwo_unit,
4921 0 /* abbrev_table_provided */,
4922 NULL /* stub_comp_unit_die */,
4923 sig_type->dwo_unit->dwo_file->comp_dir,
4925 &comp_unit_die, &has_children) == 0)
4928 do_cleanups (cleanups);
4932 /* All the "real" work is done here. */
4933 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
4935 /* This duplicates some code in init_cutu_and_read_dies,
4936 but the alternative is making the latter more complex.
4937 This function is only for the special case of using DWO files directly:
4938 no point in overly complicating the general case just to handle this. */
4941 /* We've successfully allocated this compilation unit. Let our
4942 caller clean it up when finished with it. */
4943 discard_cleanups (free_cu_cleanup);
4945 /* We can only discard free_cu_cleanup and all subsequent cleanups.
4946 So we have to manually free the abbrev table. */
4947 dwarf2_free_abbrev_table (cu);
4949 /* Link this CU into read_in_chain. */
4950 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
4951 dwarf2_per_objfile->read_in_chain = this_cu;
4954 do_cleanups (free_cu_cleanup);
4956 do_cleanups (cleanups);
4959 /* Initialize a CU (or TU) and read its DIEs.
4960 If the CU defers to a DWO file, read the DWO file as well.
4962 ABBREV_TABLE, if non-NULL, is the abbreviation table to use.
4963 Otherwise the table specified in the comp unit header is read in and used.
4964 This is an optimization for when we already have the abbrev table.
4966 If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it.
4967 Otherwise, a new CU is allocated with xmalloc.
4969 If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to
4970 read_in_chain. Otherwise the dwarf2_cu data is freed at the end.
4972 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
4973 linker) then DIE_READER_FUNC will not get called. */
4976 init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu,
4977 struct abbrev_table *abbrev_table,
4978 int use_existing_cu, int keep,
4979 die_reader_func_ftype *die_reader_func,
4982 struct objfile *objfile = dwarf2_per_objfile->objfile;
4983 struct dwarf2_section_info *section = this_cu->section;
4984 bfd *abfd = section->asection->owner;
4985 struct dwarf2_cu *cu;
4986 const gdb_byte *begin_info_ptr, *info_ptr;
4987 struct die_reader_specs reader;
4988 struct die_info *comp_unit_die;
4990 struct attribute *attr;
4991 struct cleanup *cleanups, *free_cu_cleanup = NULL;
4992 struct signatured_type *sig_type = NULL;
4993 struct dwarf2_section_info *abbrev_section;
4994 /* Non-zero if CU currently points to a DWO file and we need to
4995 reread it. When this happens we need to reread the skeleton die
4996 before we can reread the DWO file (this only applies to CUs, not TUs). */
4997 int rereading_dwo_cu = 0;
4999 if (dwarf2_die_debug)
5000 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
5001 this_cu->is_debug_types ? "type" : "comp",
5002 this_cu->offset.sect_off);
5004 if (use_existing_cu)
5007 /* If we're reading a TU directly from a DWO file, including a virtual DWO
5008 file (instead of going through the stub), short-circuit all of this. */
5009 if (this_cu->reading_dwo_directly)
5011 /* Narrow down the scope of possibilities to have to understand. */
5012 gdb_assert (this_cu->is_debug_types);
5013 gdb_assert (abbrev_table == NULL);
5014 gdb_assert (!use_existing_cu);
5015 init_tu_and_read_dwo_dies (this_cu, keep, die_reader_func, data);
5019 cleanups = make_cleanup (null_cleanup, NULL);
5021 /* This is cheap if the section is already read in. */
5022 dwarf2_read_section (objfile, section);
5024 begin_info_ptr = info_ptr = section->buffer + this_cu->offset.sect_off;
5026 abbrev_section = get_abbrev_section_for_cu (this_cu);
5028 if (use_existing_cu && this_cu->cu != NULL)
5032 /* If this CU is from a DWO file we need to start over, we need to
5033 refetch the attributes from the skeleton CU.
5034 This could be optimized by retrieving those attributes from when we
5035 were here the first time: the previous comp_unit_die was stored in
5036 comp_unit_obstack. But there's no data yet that we need this
5038 if (cu->dwo_unit != NULL)
5039 rereading_dwo_cu = 1;
5043 /* If !use_existing_cu, this_cu->cu must be NULL. */
5044 gdb_assert (this_cu->cu == NULL);
5046 cu = xmalloc (sizeof (*cu));
5047 init_one_comp_unit (cu, this_cu);
5049 /* If an error occurs while loading, release our storage. */
5050 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
5053 /* Get the header. */
5054 if (cu->header.first_die_offset.cu_off != 0 && ! rereading_dwo_cu)
5056 /* We already have the header, there's no need to read it in again. */
5057 info_ptr += cu->header.first_die_offset.cu_off;
5061 if (this_cu->is_debug_types)
5064 cu_offset type_offset_in_tu;
5066 info_ptr = read_and_check_type_unit_head (&cu->header, section,
5067 abbrev_section, info_ptr,
5069 &type_offset_in_tu);
5071 /* Since per_cu is the first member of struct signatured_type,
5072 we can go from a pointer to one to a pointer to the other. */
5073 sig_type = (struct signatured_type *) this_cu;
5074 gdb_assert (sig_type->signature == signature);
5075 gdb_assert (sig_type->type_offset_in_tu.cu_off
5076 == type_offset_in_tu.cu_off);
5077 gdb_assert (this_cu->offset.sect_off == cu->header.offset.sect_off);
5079 /* LENGTH has not been set yet for type units if we're
5080 using .gdb_index. */
5081 this_cu->length = get_cu_length (&cu->header);
5083 /* Establish the type offset that can be used to lookup the type. */
5084 sig_type->type_offset_in_section.sect_off =
5085 this_cu->offset.sect_off + sig_type->type_offset_in_tu.cu_off;
5089 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
5093 gdb_assert (this_cu->offset.sect_off == cu->header.offset.sect_off);
5094 gdb_assert (this_cu->length == get_cu_length (&cu->header));
5098 /* Skip dummy compilation units. */
5099 if (info_ptr >= begin_info_ptr + this_cu->length
5100 || peek_abbrev_code (abfd, info_ptr) == 0)
5102 do_cleanups (cleanups);
5106 /* If we don't have them yet, read the abbrevs for this compilation unit.
5107 And if we need to read them now, make sure they're freed when we're
5108 done. Note that it's important that if the CU had an abbrev table
5109 on entry we don't free it when we're done: Somewhere up the call stack
5110 it may be in use. */
5111 if (abbrev_table != NULL)
5113 gdb_assert (cu->abbrev_table == NULL);
5114 gdb_assert (cu->header.abbrev_offset.sect_off
5115 == abbrev_table->offset.sect_off);
5116 cu->abbrev_table = abbrev_table;
5118 else if (cu->abbrev_table == NULL)
5120 dwarf2_read_abbrevs (cu, abbrev_section);
5121 make_cleanup (dwarf2_free_abbrev_table, cu);
5123 else if (rereading_dwo_cu)
5125 dwarf2_free_abbrev_table (cu);
5126 dwarf2_read_abbrevs (cu, abbrev_section);
5129 /* Read the top level CU/TU die. */
5130 init_cu_die_reader (&reader, cu, section, NULL);
5131 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
5133 /* If we are in a DWO stub, process it and then read in the "real" CU/TU
5135 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a
5136 DWO CU, that this test will fail (the attribute will not be present). */
5137 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
5140 struct dwo_unit *dwo_unit;
5141 struct die_info *dwo_comp_unit_die;
5145 complaint (&symfile_complaints,
5146 _("compilation unit with DW_AT_GNU_dwo_name"
5147 " has children (offset 0x%x) [in module %s]"),
5148 this_cu->offset.sect_off, bfd_get_filename (abfd));
5150 dwo_unit = lookup_dwo_unit (this_cu, comp_unit_die);
5151 if (dwo_unit != NULL)
5153 if (read_cutu_die_from_dwo (this_cu, dwo_unit,
5154 abbrev_table != NULL,
5155 comp_unit_die, NULL,
5157 &dwo_comp_unit_die, &has_children) == 0)
5160 do_cleanups (cleanups);
5163 comp_unit_die = dwo_comp_unit_die;
5167 /* Yikes, we couldn't find the rest of the DIE, we only have
5168 the stub. A complaint has already been logged. There's
5169 not much more we can do except pass on the stub DIE to
5170 die_reader_func. We don't want to throw an error on bad
5175 /* All of the above is setup for this call. Yikes. */
5176 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5178 /* Done, clean up. */
5179 if (free_cu_cleanup != NULL)
5183 /* We've successfully allocated this compilation unit. Let our
5184 caller clean it up when finished with it. */
5185 discard_cleanups (free_cu_cleanup);
5187 /* We can only discard free_cu_cleanup and all subsequent cleanups.
5188 So we have to manually free the abbrev table. */
5189 dwarf2_free_abbrev_table (cu);
5191 /* Link this CU into read_in_chain. */
5192 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
5193 dwarf2_per_objfile->read_in_chain = this_cu;
5196 do_cleanups (free_cu_cleanup);
5199 do_cleanups (cleanups);
5202 /* Read CU/TU THIS_CU in section SECTION,
5203 but do not follow DW_AT_GNU_dwo_name if present.
5204 DWOP_FILE, if non-NULL, is the DWO/DWP file to read (the caller is assumed
5205 to have already done the lookup to find the DWO/DWP file).
5207 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and
5208 THIS_CU->is_debug_types, but nothing else.
5210 We fill in THIS_CU->length.
5212 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
5213 linker) then DIE_READER_FUNC will not get called.
5215 THIS_CU->cu is always freed when done.
5216 This is done in order to not leave THIS_CU->cu in a state where we have
5217 to care whether it refers to the "main" CU or the DWO CU. */
5220 init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu,
5221 struct dwarf2_section_info *abbrev_section,
5222 struct dwo_file *dwo_file,
5223 die_reader_func_ftype *die_reader_func,
5226 struct objfile *objfile = dwarf2_per_objfile->objfile;
5227 struct dwarf2_section_info *section = this_cu->section;
5228 bfd *abfd = section->asection->owner;
5229 struct dwarf2_cu cu;
5230 const gdb_byte *begin_info_ptr, *info_ptr;
5231 struct die_reader_specs reader;
5232 struct cleanup *cleanups;
5233 struct die_info *comp_unit_die;
5236 if (dwarf2_die_debug)
5237 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
5238 this_cu->is_debug_types ? "type" : "comp",
5239 this_cu->offset.sect_off);
5241 gdb_assert (this_cu->cu == NULL);
5243 /* This is cheap if the section is already read in. */
5244 dwarf2_read_section (objfile, section);
5246 init_one_comp_unit (&cu, this_cu);
5248 cleanups = make_cleanup (free_stack_comp_unit, &cu);
5250 begin_info_ptr = info_ptr = section->buffer + this_cu->offset.sect_off;
5251 info_ptr = read_and_check_comp_unit_head (&cu.header, section,
5252 abbrev_section, info_ptr,
5253 this_cu->is_debug_types);
5255 this_cu->length = get_cu_length (&cu.header);
5257 /* Skip dummy compilation units. */
5258 if (info_ptr >= begin_info_ptr + this_cu->length
5259 || peek_abbrev_code (abfd, info_ptr) == 0)
5261 do_cleanups (cleanups);
5265 dwarf2_read_abbrevs (&cu, abbrev_section);
5266 make_cleanup (dwarf2_free_abbrev_table, &cu);
5268 init_cu_die_reader (&reader, &cu, section, dwo_file);
5269 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
5271 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
5273 do_cleanups (cleanups);
5276 /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and
5277 does not lookup the specified DWO file.
5278 This cannot be used to read DWO files.
5280 THIS_CU->cu is always freed when done.
5281 This is done in order to not leave THIS_CU->cu in a state where we have
5282 to care whether it refers to the "main" CU or the DWO CU.
5283 We can revisit this if the data shows there's a performance issue. */
5286 init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu,
5287 die_reader_func_ftype *die_reader_func,
5290 init_cutu_and_read_dies_no_follow (this_cu,
5291 get_abbrev_section_for_cu (this_cu),
5293 die_reader_func, data);
5296 /* Type Unit Groups.
5298 Type Unit Groups are a way to collapse the set of all TUs (type units) into
5299 a more manageable set. The grouping is done by DW_AT_stmt_list entry
5300 so that all types coming from the same compilation (.o file) are grouped
5301 together. A future step could be to put the types in the same symtab as
5302 the CU the types ultimately came from. */
5305 hash_type_unit_group (const void *item)
5307 const struct type_unit_group *tu_group = item;
5309 return hash_stmt_list_entry (&tu_group->hash);
5313 eq_type_unit_group (const void *item_lhs, const void *item_rhs)
5315 const struct type_unit_group *lhs = item_lhs;
5316 const struct type_unit_group *rhs = item_rhs;
5318 return eq_stmt_list_entry (&lhs->hash, &rhs->hash);
5321 /* Allocate a hash table for type unit groups. */
5324 allocate_type_unit_groups_table (void)
5326 return htab_create_alloc_ex (3,
5327 hash_type_unit_group,
5330 &dwarf2_per_objfile->objfile->objfile_obstack,
5331 hashtab_obstack_allocate,
5332 dummy_obstack_deallocate);
5335 /* Type units that don't have DW_AT_stmt_list are grouped into their own
5336 partial symtabs. We combine several TUs per psymtab to not let the size
5337 of any one psymtab grow too big. */
5338 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31)
5339 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10
5341 /* Helper routine for get_type_unit_group.
5342 Create the type_unit_group object used to hold one or more TUs. */
5344 static struct type_unit_group *
5345 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct)
5347 struct objfile *objfile = dwarf2_per_objfile->objfile;
5348 struct dwarf2_per_cu_data *per_cu;
5349 struct type_unit_group *tu_group;
5351 tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5352 struct type_unit_group);
5353 per_cu = &tu_group->per_cu;
5354 per_cu->objfile = objfile;
5356 if (dwarf2_per_objfile->using_index)
5358 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5359 struct dwarf2_per_cu_quick_data);
5363 unsigned int line_offset = line_offset_struct.sect_off;
5364 struct partial_symtab *pst;
5367 /* Give the symtab a useful name for debug purposes. */
5368 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0)
5369 name = xstrprintf ("<type_units_%d>",
5370 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB));
5372 name = xstrprintf ("<type_units_at_0x%x>", line_offset);
5374 pst = create_partial_symtab (per_cu, name);
5380 tu_group->hash.dwo_unit = cu->dwo_unit;
5381 tu_group->hash.line_offset = line_offset_struct;
5386 /* Look up the type_unit_group for type unit CU, and create it if necessary.
5387 STMT_LIST is a DW_AT_stmt_list attribute. */
5389 static struct type_unit_group *
5390 get_type_unit_group (struct dwarf2_cu *cu, const struct attribute *stmt_list)
5392 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
5393 struct type_unit_group *tu_group;
5395 unsigned int line_offset;
5396 struct type_unit_group type_unit_group_for_lookup;
5398 if (dwarf2_per_objfile->type_unit_groups == NULL)
5400 dwarf2_per_objfile->type_unit_groups =
5401 allocate_type_unit_groups_table ();
5404 /* Do we need to create a new group, or can we use an existing one? */
5408 line_offset = DW_UNSND (stmt_list);
5409 ++tu_stats->nr_symtab_sharers;
5413 /* Ugh, no stmt_list. Rare, but we have to handle it.
5414 We can do various things here like create one group per TU or
5415 spread them over multiple groups to split up the expansion work.
5416 To avoid worst case scenarios (too many groups or too large groups)
5417 we, umm, group them in bunches. */
5418 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB
5419 | (tu_stats->nr_stmt_less_type_units
5420 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE));
5421 ++tu_stats->nr_stmt_less_type_units;
5424 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
5425 type_unit_group_for_lookup.hash.line_offset.sect_off = line_offset;
5426 slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups,
5427 &type_unit_group_for_lookup, INSERT);
5431 gdb_assert (tu_group != NULL);
5435 sect_offset line_offset_struct;
5437 line_offset_struct.sect_off = line_offset;
5438 tu_group = create_type_unit_group (cu, line_offset_struct);
5440 ++tu_stats->nr_symtabs;
5446 /* Struct used to sort TUs by their abbreviation table offset. */
5448 struct tu_abbrev_offset
5450 struct signatured_type *sig_type;
5451 sect_offset abbrev_offset;
5454 /* Helper routine for build_type_unit_groups, passed to qsort. */
5457 sort_tu_by_abbrev_offset (const void *ap, const void *bp)
5459 const struct tu_abbrev_offset * const *a = ap;
5460 const struct tu_abbrev_offset * const *b = bp;
5461 unsigned int aoff = (*a)->abbrev_offset.sect_off;
5462 unsigned int boff = (*b)->abbrev_offset.sect_off;
5464 return (aoff > boff) - (aoff < boff);
5467 /* A helper function to add a type_unit_group to a table. */
5470 add_type_unit_group_to_table (void **slot, void *datum)
5472 struct type_unit_group *tu_group = *slot;
5473 struct type_unit_group ***datap = datum;
5481 /* Efficiently read all the type units, calling init_cutu_and_read_dies on
5482 each one passing FUNC,DATA.
5484 The efficiency is because we sort TUs by the abbrev table they use and
5485 only read each abbrev table once. In one program there are 200K TUs
5486 sharing 8K abbrev tables.
5488 The main purpose of this function is to support building the
5489 dwarf2_per_objfile->type_unit_groups table.
5490 TUs typically share the DW_AT_stmt_list of the CU they came from, so we
5491 can collapse the search space by grouping them by stmt_list.
5492 The savings can be significant, in the same program from above the 200K TUs
5493 share 8K stmt_list tables.
5495 FUNC is expected to call get_type_unit_group, which will create the
5496 struct type_unit_group if necessary and add it to
5497 dwarf2_per_objfile->type_unit_groups. */
5500 build_type_unit_groups (die_reader_func_ftype *func, void *data)
5502 struct objfile *objfile = dwarf2_per_objfile->objfile;
5503 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
5504 struct cleanup *cleanups;
5505 struct abbrev_table *abbrev_table;
5506 sect_offset abbrev_offset;
5507 struct tu_abbrev_offset *sorted_by_abbrev;
5508 struct type_unit_group **iter;
5511 /* It's up to the caller to not call us multiple times. */
5512 gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL);
5514 if (dwarf2_per_objfile->n_type_units == 0)
5517 /* TUs typically share abbrev tables, and there can be way more TUs than
5518 abbrev tables. Sort by abbrev table to reduce the number of times we
5519 read each abbrev table in.
5520 Alternatives are to punt or to maintain a cache of abbrev tables.
5521 This is simpler and efficient enough for now.
5523 Later we group TUs by their DW_AT_stmt_list value (as this defines the
5524 symtab to use). Typically TUs with the same abbrev offset have the same
5525 stmt_list value too so in practice this should work well.
5527 The basic algorithm here is:
5529 sort TUs by abbrev table
5530 for each TU with same abbrev table:
5531 read abbrev table if first user
5532 read TU top level DIE
5533 [IWBN if DWO skeletons had DW_AT_stmt_list]
5536 if (dwarf2_read_debug)
5537 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n");
5539 /* Sort in a separate table to maintain the order of all_type_units
5540 for .gdb_index: TU indices directly index all_type_units. */
5541 sorted_by_abbrev = XNEWVEC (struct tu_abbrev_offset,
5542 dwarf2_per_objfile->n_type_units);
5543 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
5545 struct signatured_type *sig_type = dwarf2_per_objfile->all_type_units[i];
5547 sorted_by_abbrev[i].sig_type = sig_type;
5548 sorted_by_abbrev[i].abbrev_offset =
5549 read_abbrev_offset (sig_type->per_cu.section,
5550 sig_type->per_cu.offset);
5552 cleanups = make_cleanup (xfree, sorted_by_abbrev);
5553 qsort (sorted_by_abbrev, dwarf2_per_objfile->n_type_units,
5554 sizeof (struct tu_abbrev_offset), sort_tu_by_abbrev_offset);
5556 /* Note: In the .gdb_index case, get_type_unit_group may have already been
5557 called any number of times, so we don't reset tu_stats here. */
5559 abbrev_offset.sect_off = ~(unsigned) 0;
5560 abbrev_table = NULL;
5561 make_cleanup (abbrev_table_free_cleanup, &abbrev_table);
5563 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
5565 const struct tu_abbrev_offset *tu = &sorted_by_abbrev[i];
5567 /* Switch to the next abbrev table if necessary. */
5568 if (abbrev_table == NULL
5569 || tu->abbrev_offset.sect_off != abbrev_offset.sect_off)
5571 if (abbrev_table != NULL)
5573 abbrev_table_free (abbrev_table);
5574 /* Reset to NULL in case abbrev_table_read_table throws
5575 an error: abbrev_table_free_cleanup will get called. */
5576 abbrev_table = NULL;
5578 abbrev_offset = tu->abbrev_offset;
5580 abbrev_table_read_table (&dwarf2_per_objfile->abbrev,
5582 ++tu_stats->nr_uniq_abbrev_tables;
5585 init_cutu_and_read_dies (&tu->sig_type->per_cu, abbrev_table, 0, 0,
5589 /* type_unit_groups can be NULL if there is an error in the debug info.
5590 Just create an empty table so the rest of gdb doesn't have to watch
5591 for this error case. */
5592 if (dwarf2_per_objfile->type_unit_groups == NULL)
5594 dwarf2_per_objfile->type_unit_groups =
5595 allocate_type_unit_groups_table ();
5596 dwarf2_per_objfile->n_type_unit_groups = 0;
5599 /* Create a vector of pointers to primary type units to make it easy to
5600 iterate over them and CUs. See dw2_get_primary_cu. */
5601 dwarf2_per_objfile->n_type_unit_groups =
5602 htab_elements (dwarf2_per_objfile->type_unit_groups);
5603 dwarf2_per_objfile->all_type_unit_groups =
5604 obstack_alloc (&objfile->objfile_obstack,
5605 dwarf2_per_objfile->n_type_unit_groups
5606 * sizeof (struct type_unit_group *));
5607 iter = &dwarf2_per_objfile->all_type_unit_groups[0];
5608 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
5609 add_type_unit_group_to_table, &iter);
5610 gdb_assert (iter - &dwarf2_per_objfile->all_type_unit_groups[0]
5611 == dwarf2_per_objfile->n_type_unit_groups);
5613 do_cleanups (cleanups);
5615 if (dwarf2_read_debug)
5617 fprintf_unfiltered (gdb_stdlog, "Done building type unit groups:\n");
5618 fprintf_unfiltered (gdb_stdlog, " %d TUs\n",
5619 dwarf2_per_objfile->n_type_units);
5620 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n",
5621 tu_stats->nr_uniq_abbrev_tables);
5622 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n",
5623 tu_stats->nr_symtabs);
5624 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n",
5625 tu_stats->nr_symtab_sharers);
5626 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n",
5627 tu_stats->nr_stmt_less_type_units);
5631 /* Partial symbol tables. */
5633 /* Create a psymtab named NAME and assign it to PER_CU.
5635 The caller must fill in the following details:
5636 dirname, textlow, texthigh. */
5638 static struct partial_symtab *
5639 create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name)
5641 struct objfile *objfile = per_cu->objfile;
5642 struct partial_symtab *pst;
5644 pst = start_psymtab_common (objfile, objfile->section_offsets,
5646 objfile->global_psymbols.next,
5647 objfile->static_psymbols.next);
5649 pst->psymtabs_addrmap_supported = 1;
5651 /* This is the glue that links PST into GDB's symbol API. */
5652 pst->read_symtab_private = per_cu;
5653 pst->read_symtab = dwarf2_read_symtab;
5654 per_cu->v.psymtab = pst;
5659 /* The DATA object passed to process_psymtab_comp_unit_reader has this
5662 struct process_psymtab_comp_unit_data
5664 /* True if we are reading a DW_TAG_partial_unit. */
5666 int want_partial_unit;
5668 /* The "pretend" language that is used if the CU doesn't declare a
5671 enum language pretend_language;
5674 /* die_reader_func for process_psymtab_comp_unit. */
5677 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
5678 const gdb_byte *info_ptr,
5679 struct die_info *comp_unit_die,
5683 struct dwarf2_cu *cu = reader->cu;
5684 struct objfile *objfile = cu->objfile;
5685 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
5686 struct attribute *attr;
5688 CORE_ADDR best_lowpc = 0, best_highpc = 0;
5689 struct partial_symtab *pst;
5691 const char *filename;
5692 struct process_psymtab_comp_unit_data *info = data;
5694 if (comp_unit_die->tag == DW_TAG_partial_unit && !info->want_partial_unit)
5697 gdb_assert (! per_cu->is_debug_types);
5699 prepare_one_comp_unit (cu, comp_unit_die, info->pretend_language);
5701 cu->list_in_scope = &file_symbols;
5703 /* Allocate a new partial symbol table structure. */
5704 attr = dwarf2_attr (comp_unit_die, DW_AT_name, cu);
5705 if (attr == NULL || !DW_STRING (attr))
5708 filename = DW_STRING (attr);
5710 pst = create_partial_symtab (per_cu, filename);
5712 /* This must be done before calling dwarf2_build_include_psymtabs. */
5713 attr = dwarf2_attr (comp_unit_die, DW_AT_comp_dir, cu);
5715 pst->dirname = DW_STRING (attr);
5717 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
5719 dwarf2_find_base_address (comp_unit_die, cu);
5721 /* Possibly set the default values of LOWPC and HIGHPC from
5723 has_pc_info = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc,
5724 &best_highpc, cu, pst);
5725 if (has_pc_info == 1 && best_lowpc < best_highpc)
5726 /* Store the contiguous range if it is not empty; it can be empty for
5727 CUs with no code. */
5728 addrmap_set_empty (objfile->psymtabs_addrmap,
5729 best_lowpc + baseaddr,
5730 best_highpc + baseaddr - 1, pst);
5732 /* Check if comp unit has_children.
5733 If so, read the rest of the partial symbols from this comp unit.
5734 If not, there's no more debug_info for this comp unit. */
5737 struct partial_die_info *first_die;
5738 CORE_ADDR lowpc, highpc;
5740 lowpc = ((CORE_ADDR) -1);
5741 highpc = ((CORE_ADDR) 0);
5743 first_die = load_partial_dies (reader, info_ptr, 1);
5745 scan_partial_symbols (first_die, &lowpc, &highpc,
5748 /* If we didn't find a lowpc, set it to highpc to avoid
5749 complaints from `maint check'. */
5750 if (lowpc == ((CORE_ADDR) -1))
5753 /* If the compilation unit didn't have an explicit address range,
5754 then use the information extracted from its child dies. */
5758 best_highpc = highpc;
5761 pst->textlow = best_lowpc + baseaddr;
5762 pst->texthigh = best_highpc + baseaddr;
5764 pst->n_global_syms = objfile->global_psymbols.next -
5765 (objfile->global_psymbols.list + pst->globals_offset);
5766 pst->n_static_syms = objfile->static_psymbols.next -
5767 (objfile->static_psymbols.list + pst->statics_offset);
5768 sort_pst_symbols (objfile, pst);
5770 if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs))
5773 int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
5774 struct dwarf2_per_cu_data *iter;
5776 /* Fill in 'dependencies' here; we fill in 'users' in a
5778 pst->number_of_dependencies = len;
5779 pst->dependencies = obstack_alloc (&objfile->objfile_obstack,
5780 len * sizeof (struct symtab *));
5782 VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
5785 pst->dependencies[i] = iter->v.psymtab;
5787 VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
5790 /* Get the list of files included in the current compilation unit,
5791 and build a psymtab for each of them. */
5792 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst);
5794 if (dwarf2_read_debug)
5796 struct gdbarch *gdbarch = get_objfile_arch (objfile);
5798 fprintf_unfiltered (gdb_stdlog,
5799 "Psymtab for %s unit @0x%x: %s - %s"
5800 ", %d global, %d static syms\n",
5801 per_cu->is_debug_types ? "type" : "comp",
5802 per_cu->offset.sect_off,
5803 paddress (gdbarch, pst->textlow),
5804 paddress (gdbarch, pst->texthigh),
5805 pst->n_global_syms, pst->n_static_syms);
5809 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
5810 Process compilation unit THIS_CU for a psymtab. */
5813 process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu,
5814 int want_partial_unit,
5815 enum language pretend_language)
5817 struct process_psymtab_comp_unit_data info;
5819 /* If this compilation unit was already read in, free the
5820 cached copy in order to read it in again. This is
5821 necessary because we skipped some symbols when we first
5822 read in the compilation unit (see load_partial_dies).
5823 This problem could be avoided, but the benefit is unclear. */
5824 if (this_cu->cu != NULL)
5825 free_one_cached_comp_unit (this_cu);
5827 gdb_assert (! this_cu->is_debug_types);
5828 info.want_partial_unit = want_partial_unit;
5829 info.pretend_language = pretend_language;
5830 init_cutu_and_read_dies (this_cu, NULL, 0, 0,
5831 process_psymtab_comp_unit_reader,
5834 /* Age out any secondary CUs. */
5835 age_cached_comp_units ();
5838 /* Reader function for build_type_psymtabs. */
5841 build_type_psymtabs_reader (const struct die_reader_specs *reader,
5842 const gdb_byte *info_ptr,
5843 struct die_info *type_unit_die,
5847 struct objfile *objfile = dwarf2_per_objfile->objfile;
5848 struct dwarf2_cu *cu = reader->cu;
5849 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
5850 struct signatured_type *sig_type;
5851 struct type_unit_group *tu_group;
5852 struct attribute *attr;
5853 struct partial_die_info *first_die;
5854 CORE_ADDR lowpc, highpc;
5855 struct partial_symtab *pst;
5857 gdb_assert (data == NULL);
5858 gdb_assert (per_cu->is_debug_types);
5859 sig_type = (struct signatured_type *) per_cu;
5864 attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list);
5865 tu_group = get_type_unit_group (cu, attr);
5867 VEC_safe_push (sig_type_ptr, tu_group->tus, sig_type);
5869 prepare_one_comp_unit (cu, type_unit_die, language_minimal);
5870 cu->list_in_scope = &file_symbols;
5871 pst = create_partial_symtab (per_cu, "");
5874 first_die = load_partial_dies (reader, info_ptr, 1);
5876 lowpc = (CORE_ADDR) -1;
5877 highpc = (CORE_ADDR) 0;
5878 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu);
5880 pst->n_global_syms = objfile->global_psymbols.next -
5881 (objfile->global_psymbols.list + pst->globals_offset);
5882 pst->n_static_syms = objfile->static_psymbols.next -
5883 (objfile->static_psymbols.list + pst->statics_offset);
5884 sort_pst_symbols (objfile, pst);
5887 /* Traversal function for build_type_psymtabs. */
5890 build_type_psymtab_dependencies (void **slot, void *info)
5892 struct objfile *objfile = dwarf2_per_objfile->objfile;
5893 struct type_unit_group *tu_group = (struct type_unit_group *) *slot;
5894 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu;
5895 struct partial_symtab *pst = per_cu->v.psymtab;
5896 int len = VEC_length (sig_type_ptr, tu_group->tus);
5897 struct signatured_type *iter;
5900 gdb_assert (len > 0);
5901 gdb_assert (IS_TYPE_UNIT_GROUP (per_cu));
5903 pst->number_of_dependencies = len;
5904 pst->dependencies = obstack_alloc (&objfile->objfile_obstack,
5905 len * sizeof (struct psymtab *));
5907 VEC_iterate (sig_type_ptr, tu_group->tus, i, iter);
5910 gdb_assert (iter->per_cu.is_debug_types);
5911 pst->dependencies[i] = iter->per_cu.v.psymtab;
5912 iter->type_unit_group = tu_group;
5915 VEC_free (sig_type_ptr, tu_group->tus);
5920 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
5921 Build partial symbol tables for the .debug_types comp-units. */
5924 build_type_psymtabs (struct objfile *objfile)
5926 if (! create_all_type_units (objfile))
5929 build_type_unit_groups (build_type_psymtabs_reader, NULL);
5931 /* Now that all TUs have been processed we can fill in the dependencies. */
5932 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
5933 build_type_psymtab_dependencies, NULL);
5936 /* A cleanup function that clears objfile's psymtabs_addrmap field. */
5939 psymtabs_addrmap_cleanup (void *o)
5941 struct objfile *objfile = o;
5943 objfile->psymtabs_addrmap = NULL;
5946 /* Compute the 'user' field for each psymtab in OBJFILE. */
5949 set_partial_user (struct objfile *objfile)
5953 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5955 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
5956 struct partial_symtab *pst = per_cu->v.psymtab;
5962 for (j = 0; j < pst->number_of_dependencies; ++j)
5964 /* Set the 'user' field only if it is not already set. */
5965 if (pst->dependencies[j]->user == NULL)
5966 pst->dependencies[j]->user = pst;
5971 /* Build the partial symbol table by doing a quick pass through the
5972 .debug_info and .debug_abbrev sections. */
5975 dwarf2_build_psymtabs_hard (struct objfile *objfile)
5977 struct cleanup *back_to, *addrmap_cleanup;
5978 struct obstack temp_obstack;
5981 if (dwarf2_read_debug)
5983 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n",
5984 objfile_name (objfile));
5987 dwarf2_per_objfile->reading_partial_symbols = 1;
5989 dwarf2_read_section (objfile, &dwarf2_per_objfile->info);
5991 /* Any cached compilation units will be linked by the per-objfile
5992 read_in_chain. Make sure to free them when we're done. */
5993 back_to = make_cleanup (free_cached_comp_units, NULL);
5995 build_type_psymtabs (objfile);
5997 create_all_comp_units (objfile);
5999 /* Create a temporary address map on a temporary obstack. We later
6000 copy this to the final obstack. */
6001 obstack_init (&temp_obstack);
6002 make_cleanup_obstack_free (&temp_obstack);
6003 objfile->psymtabs_addrmap = addrmap_create_mutable (&temp_obstack);
6004 addrmap_cleanup = make_cleanup (psymtabs_addrmap_cleanup, objfile);
6006 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
6008 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
6010 process_psymtab_comp_unit (per_cu, 0, language_minimal);
6013 set_partial_user (objfile);
6015 objfile->psymtabs_addrmap = addrmap_create_fixed (objfile->psymtabs_addrmap,
6016 &objfile->objfile_obstack);
6017 discard_cleanups (addrmap_cleanup);
6019 do_cleanups (back_to);
6021 if (dwarf2_read_debug)
6022 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n",
6023 objfile_name (objfile));
6026 /* die_reader_func for load_partial_comp_unit. */
6029 load_partial_comp_unit_reader (const struct die_reader_specs *reader,
6030 const gdb_byte *info_ptr,
6031 struct die_info *comp_unit_die,
6035 struct dwarf2_cu *cu = reader->cu;
6037 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
6039 /* Check if comp unit has_children.
6040 If so, read the rest of the partial symbols from this comp unit.
6041 If not, there's no more debug_info for this comp unit. */
6043 load_partial_dies (reader, info_ptr, 0);
6046 /* Load the partial DIEs for a secondary CU into memory.
6047 This is also used when rereading a primary CU with load_all_dies. */
6050 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu)
6052 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
6053 load_partial_comp_unit_reader, NULL);
6057 read_comp_units_from_section (struct objfile *objfile,
6058 struct dwarf2_section_info *section,
6059 unsigned int is_dwz,
6062 struct dwarf2_per_cu_data ***all_comp_units)
6064 const gdb_byte *info_ptr;
6065 bfd *abfd = section->asection->owner;
6067 if (dwarf2_read_debug)
6068 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n",
6069 section->asection->name, bfd_get_filename (abfd));
6071 dwarf2_read_section (objfile, section);
6073 info_ptr = section->buffer;
6075 while (info_ptr < section->buffer + section->size)
6077 unsigned int length, initial_length_size;
6078 struct dwarf2_per_cu_data *this_cu;
6081 offset.sect_off = info_ptr - section->buffer;
6083 /* Read just enough information to find out where the next
6084 compilation unit is. */
6085 length = read_initial_length (abfd, info_ptr, &initial_length_size);
6087 /* Save the compilation unit for later lookup. */
6088 this_cu = obstack_alloc (&objfile->objfile_obstack,
6089 sizeof (struct dwarf2_per_cu_data));
6090 memset (this_cu, 0, sizeof (*this_cu));
6091 this_cu->offset = offset;
6092 this_cu->length = length + initial_length_size;
6093 this_cu->is_dwz = is_dwz;
6094 this_cu->objfile = objfile;
6095 this_cu->section = section;
6097 if (*n_comp_units == *n_allocated)
6100 *all_comp_units = xrealloc (*all_comp_units,
6102 * sizeof (struct dwarf2_per_cu_data *));
6104 (*all_comp_units)[*n_comp_units] = this_cu;
6107 info_ptr = info_ptr + this_cu->length;
6111 /* Create a list of all compilation units in OBJFILE.
6112 This is only done for -readnow and building partial symtabs. */
6115 create_all_comp_units (struct objfile *objfile)
6119 struct dwarf2_per_cu_data **all_comp_units;
6120 struct dwz_file *dwz;
6124 all_comp_units = xmalloc (n_allocated
6125 * sizeof (struct dwarf2_per_cu_data *));
6127 read_comp_units_from_section (objfile, &dwarf2_per_objfile->info, 0,
6128 &n_allocated, &n_comp_units, &all_comp_units);
6130 dwz = dwarf2_get_dwz_file ();
6132 read_comp_units_from_section (objfile, &dwz->info, 1,
6133 &n_allocated, &n_comp_units,
6136 dwarf2_per_objfile->all_comp_units
6137 = obstack_alloc (&objfile->objfile_obstack,
6138 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
6139 memcpy (dwarf2_per_objfile->all_comp_units, all_comp_units,
6140 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
6141 xfree (all_comp_units);
6142 dwarf2_per_objfile->n_comp_units = n_comp_units;
6145 /* Process all loaded DIEs for compilation unit CU, starting at
6146 FIRST_DIE. The caller should pass NEED_PC == 1 if the compilation
6147 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
6148 DW_AT_ranges). If NEED_PC is set, then this function will set
6149 *LOWPC and *HIGHPC to the lowest and highest PC values found in CU
6150 and record the covered ranges in the addrmap. */
6153 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
6154 CORE_ADDR *highpc, int need_pc, struct dwarf2_cu *cu)
6156 struct partial_die_info *pdi;
6158 /* Now, march along the PDI's, descending into ones which have
6159 interesting children but skipping the children of the other ones,
6160 until we reach the end of the compilation unit. */
6166 fixup_partial_die (pdi, cu);
6168 /* Anonymous namespaces or modules have no name but have interesting
6169 children, so we need to look at them. Ditto for anonymous
6172 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace
6173 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type
6174 || pdi->tag == DW_TAG_imported_unit)
6178 case DW_TAG_subprogram:
6179 add_partial_subprogram (pdi, lowpc, highpc, need_pc, cu);
6181 case DW_TAG_constant:
6182 case DW_TAG_variable:
6183 case DW_TAG_typedef:
6184 case DW_TAG_union_type:
6185 if (!pdi->is_declaration)
6187 add_partial_symbol (pdi, cu);
6190 case DW_TAG_class_type:
6191 case DW_TAG_interface_type:
6192 case DW_TAG_structure_type:
6193 if (!pdi->is_declaration)
6195 add_partial_symbol (pdi, cu);
6198 case DW_TAG_enumeration_type:
6199 if (!pdi->is_declaration)
6200 add_partial_enumeration (pdi, cu);
6202 case DW_TAG_base_type:
6203 case DW_TAG_subrange_type:
6204 /* File scope base type definitions are added to the partial
6206 add_partial_symbol (pdi, cu);
6208 case DW_TAG_namespace:
6209 add_partial_namespace (pdi, lowpc, highpc, need_pc, cu);
6212 add_partial_module (pdi, lowpc, highpc, need_pc, cu);
6214 case DW_TAG_imported_unit:
6216 struct dwarf2_per_cu_data *per_cu;
6218 /* For now we don't handle imported units in type units. */
6219 if (cu->per_cu->is_debug_types)
6221 error (_("Dwarf Error: DW_TAG_imported_unit is not"
6222 " supported in type units [in module %s]"),
6223 objfile_name (cu->objfile));
6226 per_cu = dwarf2_find_containing_comp_unit (pdi->d.offset,
6230 /* Go read the partial unit, if needed. */
6231 if (per_cu->v.psymtab == NULL)
6232 process_psymtab_comp_unit (per_cu, 1, cu->language);
6234 VEC_safe_push (dwarf2_per_cu_ptr,
6235 cu->per_cu->imported_symtabs, per_cu);
6243 /* If the die has a sibling, skip to the sibling. */
6245 pdi = pdi->die_sibling;
6249 /* Functions used to compute the fully scoped name of a partial DIE.
6251 Normally, this is simple. For C++, the parent DIE's fully scoped
6252 name is concatenated with "::" and the partial DIE's name. For
6253 Java, the same thing occurs except that "." is used instead of "::".
6254 Enumerators are an exception; they use the scope of their parent
6255 enumeration type, i.e. the name of the enumeration type is not
6256 prepended to the enumerator.
6258 There are two complexities. One is DW_AT_specification; in this
6259 case "parent" means the parent of the target of the specification,
6260 instead of the direct parent of the DIE. The other is compilers
6261 which do not emit DW_TAG_namespace; in this case we try to guess
6262 the fully qualified name of structure types from their members'
6263 linkage names. This must be done using the DIE's children rather
6264 than the children of any DW_AT_specification target. We only need
6265 to do this for structures at the top level, i.e. if the target of
6266 any DW_AT_specification (if any; otherwise the DIE itself) does not
6269 /* Compute the scope prefix associated with PDI's parent, in
6270 compilation unit CU. The result will be allocated on CU's
6271 comp_unit_obstack, or a copy of the already allocated PDI->NAME
6272 field. NULL is returned if no prefix is necessary. */
6274 partial_die_parent_scope (struct partial_die_info *pdi,
6275 struct dwarf2_cu *cu)
6277 const char *grandparent_scope;
6278 struct partial_die_info *parent, *real_pdi;
6280 /* We need to look at our parent DIE; if we have a DW_AT_specification,
6281 then this means the parent of the specification DIE. */
6284 while (real_pdi->has_specification)
6285 real_pdi = find_partial_die (real_pdi->spec_offset,
6286 real_pdi->spec_is_dwz, cu);
6288 parent = real_pdi->die_parent;
6292 if (parent->scope_set)
6293 return parent->scope;
6295 fixup_partial_die (parent, cu);
6297 grandparent_scope = partial_die_parent_scope (parent, cu);
6299 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
6300 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
6301 Work around this problem here. */
6302 if (cu->language == language_cplus
6303 && parent->tag == DW_TAG_namespace
6304 && strcmp (parent->name, "::") == 0
6305 && grandparent_scope == NULL)
6307 parent->scope = NULL;
6308 parent->scope_set = 1;
6312 if (pdi->tag == DW_TAG_enumerator)
6313 /* Enumerators should not get the name of the enumeration as a prefix. */
6314 parent->scope = grandparent_scope;
6315 else if (parent->tag == DW_TAG_namespace
6316 || parent->tag == DW_TAG_module
6317 || parent->tag == DW_TAG_structure_type
6318 || parent->tag == DW_TAG_class_type
6319 || parent->tag == DW_TAG_interface_type
6320 || parent->tag == DW_TAG_union_type
6321 || parent->tag == DW_TAG_enumeration_type)
6323 if (grandparent_scope == NULL)
6324 parent->scope = parent->name;
6326 parent->scope = typename_concat (&cu->comp_unit_obstack,
6328 parent->name, 0, cu);
6332 /* FIXME drow/2004-04-01: What should we be doing with
6333 function-local names? For partial symbols, we should probably be
6335 complaint (&symfile_complaints,
6336 _("unhandled containing DIE tag %d for DIE at %d"),
6337 parent->tag, pdi->offset.sect_off);
6338 parent->scope = grandparent_scope;
6341 parent->scope_set = 1;
6342 return parent->scope;
6345 /* Return the fully scoped name associated with PDI, from compilation unit
6346 CU. The result will be allocated with malloc. */
6349 partial_die_full_name (struct partial_die_info *pdi,
6350 struct dwarf2_cu *cu)
6352 const char *parent_scope;
6354 /* If this is a template instantiation, we can not work out the
6355 template arguments from partial DIEs. So, unfortunately, we have
6356 to go through the full DIEs. At least any work we do building
6357 types here will be reused if full symbols are loaded later. */
6358 if (pdi->has_template_arguments)
6360 fixup_partial_die (pdi, cu);
6362 if (pdi->name != NULL && strchr (pdi->name, '<') == NULL)
6364 struct die_info *die;
6365 struct attribute attr;
6366 struct dwarf2_cu *ref_cu = cu;
6368 /* DW_FORM_ref_addr is using section offset. */
6370 attr.form = DW_FORM_ref_addr;
6371 attr.u.unsnd = pdi->offset.sect_off;
6372 die = follow_die_ref (NULL, &attr, &ref_cu);
6374 return xstrdup (dwarf2_full_name (NULL, die, ref_cu));
6378 parent_scope = partial_die_parent_scope (pdi, cu);
6379 if (parent_scope == NULL)
6382 return typename_concat (NULL, parent_scope, pdi->name, 0, cu);
6386 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
6388 struct objfile *objfile = cu->objfile;
6390 const char *actual_name = NULL;
6392 char *built_actual_name;
6394 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
6396 built_actual_name = partial_die_full_name (pdi, cu);
6397 if (built_actual_name != NULL)
6398 actual_name = built_actual_name;
6400 if (actual_name == NULL)
6401 actual_name = pdi->name;
6405 case DW_TAG_subprogram:
6406 if (pdi->is_external || cu->language == language_ada)
6408 /* brobecker/2007-12-26: Normally, only "external" DIEs are part
6409 of the global scope. But in Ada, we want to be able to access
6410 nested procedures globally. So all Ada subprograms are stored
6411 in the global scope. */
6412 /* prim_record_minimal_symbol (actual_name, pdi->lowpc + baseaddr,
6413 mst_text, objfile); */
6414 add_psymbol_to_list (actual_name, strlen (actual_name),
6415 built_actual_name != NULL,
6416 VAR_DOMAIN, LOC_BLOCK,
6417 &objfile->global_psymbols,
6418 0, pdi->lowpc + baseaddr,
6419 cu->language, objfile);
6423 /* prim_record_minimal_symbol (actual_name, pdi->lowpc + baseaddr,
6424 mst_file_text, objfile); */
6425 add_psymbol_to_list (actual_name, strlen (actual_name),
6426 built_actual_name != NULL,
6427 VAR_DOMAIN, LOC_BLOCK,
6428 &objfile->static_psymbols,
6429 0, pdi->lowpc + baseaddr,
6430 cu->language, objfile);
6433 case DW_TAG_constant:
6435 struct psymbol_allocation_list *list;
6437 if (pdi->is_external)
6438 list = &objfile->global_psymbols;
6440 list = &objfile->static_psymbols;
6441 add_psymbol_to_list (actual_name, strlen (actual_name),
6442 built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
6443 list, 0, 0, cu->language, objfile);
6446 case DW_TAG_variable:
6448 addr = decode_locdesc (pdi->d.locdesc, cu);
6452 && !dwarf2_per_objfile->has_section_at_zero)
6454 /* A global or static variable may also have been stripped
6455 out by the linker if unused, in which case its address
6456 will be nullified; do not add such variables into partial
6457 symbol table then. */
6459 else if (pdi->is_external)
6462 Don't enter into the minimal symbol tables as there is
6463 a minimal symbol table entry from the ELF symbols already.
6464 Enter into partial symbol table if it has a location
6465 descriptor or a type.
6466 If the location descriptor is missing, new_symbol will create
6467 a LOC_UNRESOLVED symbol, the address of the variable will then
6468 be determined from the minimal symbol table whenever the variable
6470 The address for the partial symbol table entry is not
6471 used by GDB, but it comes in handy for debugging partial symbol
6474 if (pdi->d.locdesc || pdi->has_type)
6475 add_psymbol_to_list (actual_name, strlen (actual_name),
6476 built_actual_name != NULL,
6477 VAR_DOMAIN, LOC_STATIC,
6478 &objfile->global_psymbols,
6480 cu->language, objfile);
6484 /* Static Variable. Skip symbols without location descriptors. */
6485 if (pdi->d.locdesc == NULL)
6487 xfree (built_actual_name);
6490 /* prim_record_minimal_symbol (actual_name, addr + baseaddr,
6491 mst_file_data, objfile); */
6492 add_psymbol_to_list (actual_name, strlen (actual_name),
6493 built_actual_name != NULL,
6494 VAR_DOMAIN, LOC_STATIC,
6495 &objfile->static_psymbols,
6497 cu->language, objfile);
6500 case DW_TAG_typedef:
6501 case DW_TAG_base_type:
6502 case DW_TAG_subrange_type:
6503 add_psymbol_to_list (actual_name, strlen (actual_name),
6504 built_actual_name != NULL,
6505 VAR_DOMAIN, LOC_TYPEDEF,
6506 &objfile->static_psymbols,
6507 0, (CORE_ADDR) 0, cu->language, objfile);
6509 case DW_TAG_namespace:
6510 add_psymbol_to_list (actual_name, strlen (actual_name),
6511 built_actual_name != NULL,
6512 VAR_DOMAIN, LOC_TYPEDEF,
6513 &objfile->global_psymbols,
6514 0, (CORE_ADDR) 0, cu->language, objfile);
6516 case DW_TAG_class_type:
6517 case DW_TAG_interface_type:
6518 case DW_TAG_structure_type:
6519 case DW_TAG_union_type:
6520 case DW_TAG_enumeration_type:
6521 /* Skip external references. The DWARF standard says in the section
6522 about "Structure, Union, and Class Type Entries": "An incomplete
6523 structure, union or class type is represented by a structure,
6524 union or class entry that does not have a byte size attribute
6525 and that has a DW_AT_declaration attribute." */
6526 if (!pdi->has_byte_size && pdi->is_declaration)
6528 xfree (built_actual_name);
6532 /* NOTE: carlton/2003-10-07: See comment in new_symbol about
6533 static vs. global. */
6534 add_psymbol_to_list (actual_name, strlen (actual_name),
6535 built_actual_name != NULL,
6536 STRUCT_DOMAIN, LOC_TYPEDEF,
6537 (cu->language == language_cplus
6538 || cu->language == language_java)
6539 ? &objfile->global_psymbols
6540 : &objfile->static_psymbols,
6541 0, (CORE_ADDR) 0, cu->language, objfile);
6544 case DW_TAG_enumerator:
6545 add_psymbol_to_list (actual_name, strlen (actual_name),
6546 built_actual_name != NULL,
6547 VAR_DOMAIN, LOC_CONST,
6548 (cu->language == language_cplus
6549 || cu->language == language_java)
6550 ? &objfile->global_psymbols
6551 : &objfile->static_psymbols,
6552 0, (CORE_ADDR) 0, cu->language, objfile);
6558 xfree (built_actual_name);
6561 /* Read a partial die corresponding to a namespace; also, add a symbol
6562 corresponding to that namespace to the symbol table. NAMESPACE is
6563 the name of the enclosing namespace. */
6566 add_partial_namespace (struct partial_die_info *pdi,
6567 CORE_ADDR *lowpc, CORE_ADDR *highpc,
6568 int need_pc, struct dwarf2_cu *cu)
6570 /* Add a symbol for the namespace. */
6572 add_partial_symbol (pdi, cu);
6574 /* Now scan partial symbols in that namespace. */
6576 if (pdi->has_children)
6577 scan_partial_symbols (pdi->die_child, lowpc, highpc, need_pc, cu);
6580 /* Read a partial die corresponding to a Fortran module. */
6583 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
6584 CORE_ADDR *highpc, int need_pc, struct dwarf2_cu *cu)
6586 /* Now scan partial symbols in that module. */
6588 if (pdi->has_children)
6589 scan_partial_symbols (pdi->die_child, lowpc, highpc, need_pc, cu);
6592 /* Read a partial die corresponding to a subprogram and create a partial
6593 symbol for that subprogram. When the CU language allows it, this
6594 routine also defines a partial symbol for each nested subprogram
6595 that this subprogram contains.
6597 DIE my also be a lexical block, in which case we simply search
6598 recursively for suprograms defined inside that lexical block.
6599 Again, this is only performed when the CU language allows this
6600 type of definitions. */
6603 add_partial_subprogram (struct partial_die_info *pdi,
6604 CORE_ADDR *lowpc, CORE_ADDR *highpc,
6605 int need_pc, struct dwarf2_cu *cu)
6607 if (pdi->tag == DW_TAG_subprogram)
6609 if (pdi->has_pc_info)
6611 if (pdi->lowpc < *lowpc)
6612 *lowpc = pdi->lowpc;
6613 if (pdi->highpc > *highpc)
6614 *highpc = pdi->highpc;
6618 struct objfile *objfile = cu->objfile;
6620 baseaddr = ANOFFSET (objfile->section_offsets,
6621 SECT_OFF_TEXT (objfile));
6622 addrmap_set_empty (objfile->psymtabs_addrmap,
6623 pdi->lowpc + baseaddr,
6624 pdi->highpc - 1 + baseaddr,
6625 cu->per_cu->v.psymtab);
6629 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined))
6631 if (!pdi->is_declaration)
6632 /* Ignore subprogram DIEs that do not have a name, they are
6633 illegal. Do not emit a complaint at this point, we will
6634 do so when we convert this psymtab into a symtab. */
6636 add_partial_symbol (pdi, cu);
6640 if (! pdi->has_children)
6643 if (cu->language == language_ada)
6645 pdi = pdi->die_child;
6648 fixup_partial_die (pdi, cu);
6649 if (pdi->tag == DW_TAG_subprogram
6650 || pdi->tag == DW_TAG_lexical_block)
6651 add_partial_subprogram (pdi, lowpc, highpc, need_pc, cu);
6652 pdi = pdi->die_sibling;
6657 /* Read a partial die corresponding to an enumeration type. */
6660 add_partial_enumeration (struct partial_die_info *enum_pdi,
6661 struct dwarf2_cu *cu)
6663 struct partial_die_info *pdi;
6665 if (enum_pdi->name != NULL)
6666 add_partial_symbol (enum_pdi, cu);
6668 pdi = enum_pdi->die_child;
6671 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL)
6672 complaint (&symfile_complaints, _("malformed enumerator DIE ignored"));
6674 add_partial_symbol (pdi, cu);
6675 pdi = pdi->die_sibling;
6679 /* Return the initial uleb128 in the die at INFO_PTR. */
6682 peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr)
6684 unsigned int bytes_read;
6686 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
6689 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit CU.
6690 Return the corresponding abbrev, or NULL if the number is zero (indicating
6691 an empty DIE). In either case *BYTES_READ will be set to the length of
6692 the initial number. */
6694 static struct abbrev_info *
6695 peek_die_abbrev (const gdb_byte *info_ptr, unsigned int *bytes_read,
6696 struct dwarf2_cu *cu)
6698 bfd *abfd = cu->objfile->obfd;
6699 unsigned int abbrev_number;
6700 struct abbrev_info *abbrev;
6702 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
6704 if (abbrev_number == 0)
6707 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
6710 error (_("Dwarf Error: Could not find abbrev number %d [in module %s]"),
6711 abbrev_number, bfd_get_filename (abfd));
6717 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
6718 Returns a pointer to the end of a series of DIEs, terminated by an empty
6719 DIE. Any children of the skipped DIEs will also be skipped. */
6721 static const gdb_byte *
6722 skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr)
6724 struct dwarf2_cu *cu = reader->cu;
6725 struct abbrev_info *abbrev;
6726 unsigned int bytes_read;
6730 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
6732 return info_ptr + bytes_read;
6734 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
6738 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
6739 INFO_PTR should point just after the initial uleb128 of a DIE, and the
6740 abbrev corresponding to that skipped uleb128 should be passed in
6741 ABBREV. Returns a pointer to this DIE's sibling, skipping any
6744 static const gdb_byte *
6745 skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr,
6746 struct abbrev_info *abbrev)
6748 unsigned int bytes_read;
6749 struct attribute attr;
6750 bfd *abfd = reader->abfd;
6751 struct dwarf2_cu *cu = reader->cu;
6752 const gdb_byte *buffer = reader->buffer;
6753 const gdb_byte *buffer_end = reader->buffer_end;
6754 const gdb_byte *start_info_ptr = info_ptr;
6755 unsigned int form, i;
6757 for (i = 0; i < abbrev->num_attrs; i++)
6759 /* The only abbrev we care about is DW_AT_sibling. */
6760 if (abbrev->attrs[i].name == DW_AT_sibling)
6762 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
6763 if (attr.form == DW_FORM_ref_addr)
6764 complaint (&symfile_complaints,
6765 _("ignoring absolute DW_AT_sibling"));
6767 return buffer + dwarf2_get_ref_die_offset (&attr).sect_off;
6770 /* If it isn't DW_AT_sibling, skip this attribute. */
6771 form = abbrev->attrs[i].form;
6775 case DW_FORM_ref_addr:
6776 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3
6777 and later it is offset sized. */
6778 if (cu->header.version == 2)
6779 info_ptr += cu->header.addr_size;
6781 info_ptr += cu->header.offset_size;
6783 case DW_FORM_GNU_ref_alt:
6784 info_ptr += cu->header.offset_size;
6787 info_ptr += cu->header.addr_size;
6794 case DW_FORM_flag_present:
6806 case DW_FORM_ref_sig8:
6809 case DW_FORM_string:
6810 read_direct_string (abfd, info_ptr, &bytes_read);
6811 info_ptr += bytes_read;
6813 case DW_FORM_sec_offset:
6815 case DW_FORM_GNU_strp_alt:
6816 info_ptr += cu->header.offset_size;
6818 case DW_FORM_exprloc:
6820 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
6821 info_ptr += bytes_read;
6823 case DW_FORM_block1:
6824 info_ptr += 1 + read_1_byte (abfd, info_ptr);
6826 case DW_FORM_block2:
6827 info_ptr += 2 + read_2_bytes (abfd, info_ptr);
6829 case DW_FORM_block4:
6830 info_ptr += 4 + read_4_bytes (abfd, info_ptr);
6834 case DW_FORM_ref_udata:
6835 case DW_FORM_GNU_addr_index:
6836 case DW_FORM_GNU_str_index:
6837 info_ptr = safe_skip_leb128 (info_ptr, buffer_end);
6839 case DW_FORM_indirect:
6840 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
6841 info_ptr += bytes_read;
6842 /* We need to continue parsing from here, so just go back to
6844 goto skip_attribute;
6847 error (_("Dwarf Error: Cannot handle %s "
6848 "in DWARF reader [in module %s]"),
6849 dwarf_form_name (form),
6850 bfd_get_filename (abfd));
6854 if (abbrev->has_children)
6855 return skip_children (reader, info_ptr);
6860 /* Locate ORIG_PDI's sibling.
6861 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
6863 static const gdb_byte *
6864 locate_pdi_sibling (const struct die_reader_specs *reader,
6865 struct partial_die_info *orig_pdi,
6866 const gdb_byte *info_ptr)
6868 /* Do we know the sibling already? */
6870 if (orig_pdi->sibling)
6871 return orig_pdi->sibling;
6873 /* Are there any children to deal with? */
6875 if (!orig_pdi->has_children)
6878 /* Skip the children the long way. */
6880 return skip_children (reader, info_ptr);
6883 /* Expand this partial symbol table into a full symbol table. SELF is
6887 dwarf2_read_symtab (struct partial_symtab *self,
6888 struct objfile *objfile)
6892 warning (_("bug: psymtab for %s is already read in."),
6899 printf_filtered (_("Reading in symbols for %s..."),
6901 gdb_flush (gdb_stdout);
6904 /* Restore our global data. */
6905 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
6907 /* If this psymtab is constructed from a debug-only objfile, the
6908 has_section_at_zero flag will not necessarily be correct. We
6909 can get the correct value for this flag by looking at the data
6910 associated with the (presumably stripped) associated objfile. */
6911 if (objfile->separate_debug_objfile_backlink)
6913 struct dwarf2_per_objfile *dpo_backlink
6914 = objfile_data (objfile->separate_debug_objfile_backlink,
6915 dwarf2_objfile_data_key);
6917 dwarf2_per_objfile->has_section_at_zero
6918 = dpo_backlink->has_section_at_zero;
6921 dwarf2_per_objfile->reading_partial_symbols = 0;
6923 psymtab_to_symtab_1 (self);
6925 /* Finish up the debug error message. */
6927 printf_filtered (_("done.\n"));
6930 process_cu_includes ();
6933 /* Reading in full CUs. */
6935 /* Add PER_CU to the queue. */
6938 queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
6939 enum language pretend_language)
6941 struct dwarf2_queue_item *item;
6944 item = xmalloc (sizeof (*item));
6945 item->per_cu = per_cu;
6946 item->pretend_language = pretend_language;
6949 if (dwarf2_queue == NULL)
6950 dwarf2_queue = item;
6952 dwarf2_queue_tail->next = item;
6954 dwarf2_queue_tail = item;
6957 /* If PER_CU is not yet queued, add it to the queue.
6958 If DEPENDENT_CU is non-NULL, it has a reference to PER_CU so add a
6960 The result is non-zero if PER_CU was queued, otherwise the result is zero
6961 meaning either PER_CU is already queued or it is already loaded.
6963 N.B. There is an invariant here that if a CU is queued then it is loaded.
6964 The caller is required to load PER_CU if we return non-zero. */
6967 maybe_queue_comp_unit (struct dwarf2_cu *dependent_cu,
6968 struct dwarf2_per_cu_data *per_cu,
6969 enum language pretend_language)
6971 /* We may arrive here during partial symbol reading, if we need full
6972 DIEs to process an unusual case (e.g. template arguments). Do
6973 not queue PER_CU, just tell our caller to load its DIEs. */
6974 if (dwarf2_per_objfile->reading_partial_symbols)
6976 if (per_cu->cu == NULL || per_cu->cu->dies == NULL)
6981 /* Mark the dependence relation so that we don't flush PER_CU
6983 if (dependent_cu != NULL)
6984 dwarf2_add_dependence (dependent_cu, per_cu);
6986 /* If it's already on the queue, we have nothing to do. */
6990 /* If the compilation unit is already loaded, just mark it as
6992 if (per_cu->cu != NULL)
6994 per_cu->cu->last_used = 0;
6998 /* Add it to the queue. */
6999 queue_comp_unit (per_cu, pretend_language);
7004 /* Process the queue. */
7007 process_queue (void)
7009 struct dwarf2_queue_item *item, *next_item;
7011 if (dwarf2_read_debug)
7013 fprintf_unfiltered (gdb_stdlog,
7014 "Expanding one or more symtabs of objfile %s ...\n",
7015 objfile_name (dwarf2_per_objfile->objfile));
7018 /* The queue starts out with one item, but following a DIE reference
7019 may load a new CU, adding it to the end of the queue. */
7020 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item)
7022 if (dwarf2_per_objfile->using_index
7023 ? !item->per_cu->v.quick->symtab
7024 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin))
7026 struct dwarf2_per_cu_data *per_cu = item->per_cu;
7029 if (per_cu->is_debug_types)
7031 struct signatured_type *sig_type =
7032 (struct signatured_type *) per_cu;
7034 sprintf (buf, "TU %s at offset 0x%x",
7035 hex_string (sig_type->signature), per_cu->offset.sect_off);
7038 sprintf (buf, "CU at offset 0x%x", per_cu->offset.sect_off);
7040 if (dwarf2_read_debug)
7041 fprintf_unfiltered (gdb_stdlog, "Expanding symtab of %s\n", buf);
7043 if (per_cu->is_debug_types)
7044 process_full_type_unit (per_cu, item->pretend_language);
7046 process_full_comp_unit (per_cu, item->pretend_language);
7048 if (dwarf2_read_debug)
7049 fprintf_unfiltered (gdb_stdlog, "Done expanding %s\n", buf);
7052 item->per_cu->queued = 0;
7053 next_item = item->next;
7057 dwarf2_queue_tail = NULL;
7059 if (dwarf2_read_debug)
7061 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
7062 objfile_name (dwarf2_per_objfile->objfile));
7066 /* Free all allocated queue entries. This function only releases anything if
7067 an error was thrown; if the queue was processed then it would have been
7068 freed as we went along. */
7071 dwarf2_release_queue (void *dummy)
7073 struct dwarf2_queue_item *item, *last;
7075 item = dwarf2_queue;
7078 /* Anything still marked queued is likely to be in an
7079 inconsistent state, so discard it. */
7080 if (item->per_cu->queued)
7082 if (item->per_cu->cu != NULL)
7083 free_one_cached_comp_unit (item->per_cu);
7084 item->per_cu->queued = 0;
7092 dwarf2_queue = dwarf2_queue_tail = NULL;
7095 /* Read in full symbols for PST, and anything it depends on. */
7098 psymtab_to_symtab_1 (struct partial_symtab *pst)
7100 struct dwarf2_per_cu_data *per_cu;
7106 for (i = 0; i < pst->number_of_dependencies; i++)
7107 if (!pst->dependencies[i]->readin
7108 && pst->dependencies[i]->user == NULL)
7110 /* Inform about additional files that need to be read in. */
7113 /* FIXME: i18n: Need to make this a single string. */
7114 fputs_filtered (" ", gdb_stdout);
7116 fputs_filtered ("and ", gdb_stdout);
7118 printf_filtered ("%s...", pst->dependencies[i]->filename);
7119 wrap_here (""); /* Flush output. */
7120 gdb_flush (gdb_stdout);
7122 psymtab_to_symtab_1 (pst->dependencies[i]);
7125 per_cu = pst->read_symtab_private;
7129 /* It's an include file, no symbols to read for it.
7130 Everything is in the parent symtab. */
7135 dw2_do_instantiate_symtab (per_cu);
7138 /* Trivial hash function for die_info: the hash value of a DIE
7139 is its offset in .debug_info for this objfile. */
7142 die_hash (const void *item)
7144 const struct die_info *die = item;
7146 return die->offset.sect_off;
7149 /* Trivial comparison function for die_info structures: two DIEs
7150 are equal if they have the same offset. */
7153 die_eq (const void *item_lhs, const void *item_rhs)
7155 const struct die_info *die_lhs = item_lhs;
7156 const struct die_info *die_rhs = item_rhs;
7158 return die_lhs->offset.sect_off == die_rhs->offset.sect_off;
7161 /* die_reader_func for load_full_comp_unit.
7162 This is identical to read_signatured_type_reader,
7163 but is kept separate for now. */
7166 load_full_comp_unit_reader (const struct die_reader_specs *reader,
7167 const gdb_byte *info_ptr,
7168 struct die_info *comp_unit_die,
7172 struct dwarf2_cu *cu = reader->cu;
7173 enum language *language_ptr = data;
7175 gdb_assert (cu->die_hash == NULL);
7177 htab_create_alloc_ex (cu->header.length / 12,
7181 &cu->comp_unit_obstack,
7182 hashtab_obstack_allocate,
7183 dummy_obstack_deallocate);
7186 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
7187 &info_ptr, comp_unit_die);
7188 cu->dies = comp_unit_die;
7189 /* comp_unit_die is not stored in die_hash, no need. */
7191 /* We try not to read any attributes in this function, because not
7192 all CUs needed for references have been loaded yet, and symbol
7193 table processing isn't initialized. But we have to set the CU language,
7194 or we won't be able to build types correctly.
7195 Similarly, if we do not read the producer, we can not apply
7196 producer-specific interpretation. */
7197 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
7200 /* Load the DIEs associated with PER_CU into memory. */
7203 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
7204 enum language pretend_language)
7206 gdb_assert (! this_cu->is_debug_types);
7208 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
7209 load_full_comp_unit_reader, &pretend_language);
7212 /* Add a DIE to the delayed physname list. */
7215 add_to_method_list (struct type *type, int fnfield_index, int index,
7216 const char *name, struct die_info *die,
7217 struct dwarf2_cu *cu)
7219 struct delayed_method_info mi;
7221 mi.fnfield_index = fnfield_index;
7225 VEC_safe_push (delayed_method_info, cu->method_list, &mi);
7228 /* A cleanup for freeing the delayed method list. */
7231 free_delayed_list (void *ptr)
7233 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr;
7234 if (cu->method_list != NULL)
7236 VEC_free (delayed_method_info, cu->method_list);
7237 cu->method_list = NULL;
7241 /* Compute the physnames of any methods on the CU's method list.
7243 The computation of method physnames is delayed in order to avoid the
7244 (bad) condition that one of the method's formal parameters is of an as yet
7248 compute_delayed_physnames (struct dwarf2_cu *cu)
7251 struct delayed_method_info *mi;
7252 for (i = 0; VEC_iterate (delayed_method_info, cu->method_list, i, mi) ; ++i)
7254 const char *physname;
7255 struct fn_fieldlist *fn_flp
7256 = &TYPE_FN_FIELDLIST (mi->type, mi->fnfield_index);
7257 physname = dwarf2_physname (mi->name, mi->die, cu);
7258 fn_flp->fn_fields[mi->index].physname = physname ? physname : "";
7262 /* Go objects should be embedded in a DW_TAG_module DIE,
7263 and it's not clear if/how imported objects will appear.
7264 To keep Go support simple until that's worked out,
7265 go back through what we've read and create something usable.
7266 We could do this while processing each DIE, and feels kinda cleaner,
7267 but that way is more invasive.
7268 This is to, for example, allow the user to type "p var" or "b main"
7269 without having to specify the package name, and allow lookups
7270 of module.object to work in contexts that use the expression
7274 fixup_go_packaging (struct dwarf2_cu *cu)
7276 char *package_name = NULL;
7277 struct pending *list;
7280 for (list = global_symbols; list != NULL; list = list->next)
7282 for (i = 0; i < list->nsyms; ++i)
7284 struct symbol *sym = list->symbol[i];
7286 if (SYMBOL_LANGUAGE (sym) == language_go
7287 && SYMBOL_CLASS (sym) == LOC_BLOCK)
7289 char *this_package_name = go_symbol_package_name (sym);
7291 if (this_package_name == NULL)
7293 if (package_name == NULL)
7294 package_name = this_package_name;
7297 if (strcmp (package_name, this_package_name) != 0)
7298 complaint (&symfile_complaints,
7299 _("Symtab %s has objects from two different Go packages: %s and %s"),
7300 (SYMBOL_SYMTAB (sym)
7301 ? symtab_to_filename_for_display (SYMBOL_SYMTAB (sym))
7302 : objfile_name (cu->objfile)),
7303 this_package_name, package_name);
7304 xfree (this_package_name);
7310 if (package_name != NULL)
7312 struct objfile *objfile = cu->objfile;
7313 const char *saved_package_name = obstack_copy0 (&objfile->objfile_obstack,
7315 strlen (package_name));
7316 struct type *type = init_type (TYPE_CODE_MODULE, 0, 0,
7317 saved_package_name, objfile);
7320 TYPE_TAG_NAME (type) = TYPE_NAME (type);
7322 sym = allocate_symbol (objfile);
7323 SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
7324 SYMBOL_SET_NAMES (sym, saved_package_name,
7325 strlen (saved_package_name), 0, objfile);
7326 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
7327 e.g., "main" finds the "main" module and not C's main(). */
7328 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
7329 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
7330 SYMBOL_TYPE (sym) = type;
7332 add_symbol_to_list (sym, &global_symbols);
7334 xfree (package_name);
7338 /* Return the symtab for PER_CU. This works properly regardless of
7339 whether we're using the index or psymtabs. */
7341 static struct symtab *
7342 get_symtab (struct dwarf2_per_cu_data *per_cu)
7344 return (dwarf2_per_objfile->using_index
7345 ? per_cu->v.quick->symtab
7346 : per_cu->v.psymtab->symtab);
7349 /* A helper function for computing the list of all symbol tables
7350 included by PER_CU. */
7353 recursively_compute_inclusions (VEC (symtab_ptr) **result,
7354 htab_t all_children, htab_t all_type_symtabs,
7355 struct dwarf2_per_cu_data *per_cu,
7356 struct symtab *immediate_parent)
7360 struct symtab *symtab;
7361 struct dwarf2_per_cu_data *iter;
7363 slot = htab_find_slot (all_children, per_cu, INSERT);
7366 /* This inclusion and its children have been processed. */
7371 /* Only add a CU if it has a symbol table. */
7372 symtab = get_symtab (per_cu);
7375 /* If this is a type unit only add its symbol table if we haven't
7376 seen it yet (type unit per_cu's can share symtabs). */
7377 if (per_cu->is_debug_types)
7379 slot = htab_find_slot (all_type_symtabs, symtab, INSERT);
7383 VEC_safe_push (symtab_ptr, *result, symtab);
7384 if (symtab->user == NULL)
7385 symtab->user = immediate_parent;
7390 VEC_safe_push (symtab_ptr, *result, symtab);
7391 if (symtab->user == NULL)
7392 symtab->user = immediate_parent;
7397 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
7400 recursively_compute_inclusions (result, all_children,
7401 all_type_symtabs, iter, symtab);
7405 /* Compute the symtab 'includes' fields for the symtab related to
7409 compute_symtab_includes (struct dwarf2_per_cu_data *per_cu)
7411 gdb_assert (! per_cu->is_debug_types);
7413 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
7416 struct dwarf2_per_cu_data *per_cu_iter;
7417 struct symtab *symtab_iter;
7418 VEC (symtab_ptr) *result_symtabs = NULL;
7419 htab_t all_children, all_type_symtabs;
7420 struct symtab *symtab = get_symtab (per_cu);
7422 /* If we don't have a symtab, we can just skip this case. */
7426 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
7427 NULL, xcalloc, xfree);
7428 all_type_symtabs = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
7429 NULL, xcalloc, xfree);
7432 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
7436 recursively_compute_inclusions (&result_symtabs, all_children,
7437 all_type_symtabs, per_cu_iter,
7441 /* Now we have a transitive closure of all the included symtabs. */
7442 len = VEC_length (symtab_ptr, result_symtabs);
7444 = obstack_alloc (&dwarf2_per_objfile->objfile->objfile_obstack,
7445 (len + 1) * sizeof (struct symtab *));
7447 VEC_iterate (symtab_ptr, result_symtabs, ix, symtab_iter);
7449 symtab->includes[ix] = symtab_iter;
7450 symtab->includes[len] = NULL;
7452 VEC_free (symtab_ptr, result_symtabs);
7453 htab_delete (all_children);
7454 htab_delete (all_type_symtabs);
7458 /* Compute the 'includes' field for the symtabs of all the CUs we just
7462 process_cu_includes (void)
7465 struct dwarf2_per_cu_data *iter;
7468 VEC_iterate (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus,
7472 if (! iter->is_debug_types)
7473 compute_symtab_includes (iter);
7476 VEC_free (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus);
7479 /* Generate full symbol information for PER_CU, whose DIEs have
7480 already been loaded into memory. */
7483 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
7484 enum language pretend_language)
7486 struct dwarf2_cu *cu = per_cu->cu;
7487 struct objfile *objfile = per_cu->objfile;
7488 CORE_ADDR lowpc, highpc;
7489 struct symtab *symtab;
7490 struct cleanup *back_to, *delayed_list_cleanup;
7492 struct block *static_block;
7494 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
7497 back_to = make_cleanup (really_free_pendings, NULL);
7498 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
7500 cu->list_in_scope = &file_symbols;
7502 cu->language = pretend_language;
7503 cu->language_defn = language_def (cu->language);
7505 /* Do line number decoding in read_file_scope () */
7506 process_die (cu->dies, cu);
7508 /* For now fudge the Go package. */
7509 if (cu->language == language_go)
7510 fixup_go_packaging (cu);
7512 /* Now that we have processed all the DIEs in the CU, all the types
7513 should be complete, and it should now be safe to compute all of the
7515 compute_delayed_physnames (cu);
7516 do_cleanups (delayed_list_cleanup);
7518 /* Some compilers don't define a DW_AT_high_pc attribute for the
7519 compilation unit. If the DW_AT_high_pc is missing, synthesize
7520 it, by scanning the DIE's below the compilation unit. */
7521 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
7524 = end_symtab_get_static_block (highpc + baseaddr, objfile, 0, 1);
7526 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
7527 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
7528 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
7529 addrmap to help ensure it has an accurate map of pc values belonging to
7531 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
7533 symtab = end_symtab_from_static_block (static_block, objfile,
7534 SECT_OFF_TEXT (objfile), 0);
7538 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
7540 /* Set symtab language to language from DW_AT_language. If the
7541 compilation is from a C file generated by language preprocessors, do
7542 not set the language if it was already deduced by start_subfile. */
7543 if (!(cu->language == language_c && symtab->language != language_c))
7544 symtab->language = cu->language;
7546 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
7547 produce DW_AT_location with location lists but it can be possibly
7548 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
7549 there were bugs in prologue debug info, fixed later in GCC-4.5
7550 by "unwind info for epilogues" patch (which is not directly related).
7552 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
7553 needed, it would be wrong due to missing DW_AT_producer there.
7555 Still one can confuse GDB by using non-standard GCC compilation
7556 options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
7558 if (cu->has_loclist && gcc_4_minor >= 5)
7559 symtab->locations_valid = 1;
7561 if (gcc_4_minor >= 5)
7562 symtab->epilogue_unwind_valid = 1;
7564 symtab->call_site_htab = cu->call_site_htab;
7567 if (dwarf2_per_objfile->using_index)
7568 per_cu->v.quick->symtab = symtab;
7571 struct partial_symtab *pst = per_cu->v.psymtab;
7572 pst->symtab = symtab;
7576 /* Push it for inclusion processing later. */
7577 VEC_safe_push (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus, per_cu);
7579 do_cleanups (back_to);
7582 /* Generate full symbol information for type unit PER_CU, whose DIEs have
7583 already been loaded into memory. */
7586 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
7587 enum language pretend_language)
7589 struct dwarf2_cu *cu = per_cu->cu;
7590 struct objfile *objfile = per_cu->objfile;
7591 struct symtab *symtab;
7592 struct cleanup *back_to, *delayed_list_cleanup;
7593 struct signatured_type *sig_type;
7595 gdb_assert (per_cu->is_debug_types);
7596 sig_type = (struct signatured_type *) per_cu;
7599 back_to = make_cleanup (really_free_pendings, NULL);
7600 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
7602 cu->list_in_scope = &file_symbols;
7604 cu->language = pretend_language;
7605 cu->language_defn = language_def (cu->language);
7607 /* The symbol tables are set up in read_type_unit_scope. */
7608 process_die (cu->dies, cu);
7610 /* For now fudge the Go package. */
7611 if (cu->language == language_go)
7612 fixup_go_packaging (cu);
7614 /* Now that we have processed all the DIEs in the CU, all the types
7615 should be complete, and it should now be safe to compute all of the
7617 compute_delayed_physnames (cu);
7618 do_cleanups (delayed_list_cleanup);
7620 /* TUs share symbol tables.
7621 If this is the first TU to use this symtab, complete the construction
7622 of it with end_expandable_symtab. Otherwise, complete the addition of
7623 this TU's symbols to the existing symtab. */
7624 if (sig_type->type_unit_group->primary_symtab == NULL)
7626 symtab = end_expandable_symtab (0, objfile, SECT_OFF_TEXT (objfile));
7627 sig_type->type_unit_group->primary_symtab = symtab;
7631 /* Set symtab language to language from DW_AT_language. If the
7632 compilation is from a C file generated by language preprocessors,
7633 do not set the language if it was already deduced by
7635 if (!(cu->language == language_c && symtab->language != language_c))
7636 symtab->language = cu->language;
7641 augment_type_symtab (objfile,
7642 sig_type->type_unit_group->primary_symtab);
7643 symtab = sig_type->type_unit_group->primary_symtab;
7646 if (dwarf2_per_objfile->using_index)
7647 per_cu->v.quick->symtab = symtab;
7650 struct partial_symtab *pst = per_cu->v.psymtab;
7651 pst->symtab = symtab;
7655 do_cleanups (back_to);
7658 /* Process an imported unit DIE. */
7661 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
7663 struct attribute *attr;
7665 /* For now we don't handle imported units in type units. */
7666 if (cu->per_cu->is_debug_types)
7668 error (_("Dwarf Error: DW_TAG_imported_unit is not"
7669 " supported in type units [in module %s]"),
7670 objfile_name (cu->objfile));
7673 attr = dwarf2_attr (die, DW_AT_import, cu);
7676 struct dwarf2_per_cu_data *per_cu;
7677 struct symtab *imported_symtab;
7681 offset = dwarf2_get_ref_die_offset (attr);
7682 is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
7683 per_cu = dwarf2_find_containing_comp_unit (offset, is_dwz, cu->objfile);
7685 /* If necessary, add it to the queue and load its DIEs. */
7686 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
7687 load_full_comp_unit (per_cu, cu->language);
7689 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
7694 /* Process a die and its children. */
7697 process_die (struct die_info *die, struct dwarf2_cu *cu)
7701 case DW_TAG_padding:
7703 case DW_TAG_compile_unit:
7704 case DW_TAG_partial_unit:
7705 read_file_scope (die, cu);
7707 case DW_TAG_type_unit:
7708 read_type_unit_scope (die, cu);
7710 case DW_TAG_subprogram:
7711 case DW_TAG_inlined_subroutine:
7712 read_func_scope (die, cu);
7714 case DW_TAG_lexical_block:
7715 case DW_TAG_try_block:
7716 case DW_TAG_catch_block:
7717 read_lexical_block_scope (die, cu);
7719 case DW_TAG_GNU_call_site:
7720 read_call_site_scope (die, cu);
7722 case DW_TAG_class_type:
7723 case DW_TAG_interface_type:
7724 case DW_TAG_structure_type:
7725 case DW_TAG_union_type:
7726 process_structure_scope (die, cu);
7728 case DW_TAG_enumeration_type:
7729 process_enumeration_scope (die, cu);
7732 /* These dies have a type, but processing them does not create
7733 a symbol or recurse to process the children. Therefore we can
7734 read them on-demand through read_type_die. */
7735 case DW_TAG_subroutine_type:
7736 case DW_TAG_set_type:
7737 case DW_TAG_array_type:
7738 case DW_TAG_pointer_type:
7739 case DW_TAG_ptr_to_member_type:
7740 case DW_TAG_reference_type:
7741 case DW_TAG_string_type:
7744 case DW_TAG_base_type:
7745 case DW_TAG_subrange_type:
7746 case DW_TAG_typedef:
7747 /* Add a typedef symbol for the type definition, if it has a
7749 new_symbol (die, read_type_die (die, cu), cu);
7751 case DW_TAG_common_block:
7752 read_common_block (die, cu);
7754 case DW_TAG_common_inclusion:
7756 case DW_TAG_namespace:
7757 cu->processing_has_namespace_info = 1;
7758 read_namespace (die, cu);
7761 cu->processing_has_namespace_info = 1;
7762 read_module (die, cu);
7764 case DW_TAG_imported_declaration:
7765 case DW_TAG_imported_module:
7766 cu->processing_has_namespace_info = 1;
7767 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
7768 || cu->language != language_fortran))
7769 complaint (&symfile_complaints, _("Tag '%s' has unexpected children"),
7770 dwarf_tag_name (die->tag));
7771 read_import_statement (die, cu);
7774 case DW_TAG_imported_unit:
7775 process_imported_unit_die (die, cu);
7779 new_symbol (die, NULL, cu);
7784 /* DWARF name computation. */
7786 /* A helper function for dwarf2_compute_name which determines whether DIE
7787 needs to have the name of the scope prepended to the name listed in the
7791 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
7793 struct attribute *attr;
7797 case DW_TAG_namespace:
7798 case DW_TAG_typedef:
7799 case DW_TAG_class_type:
7800 case DW_TAG_interface_type:
7801 case DW_TAG_structure_type:
7802 case DW_TAG_union_type:
7803 case DW_TAG_enumeration_type:
7804 case DW_TAG_enumerator:
7805 case DW_TAG_subprogram:
7809 case DW_TAG_variable:
7810 case DW_TAG_constant:
7811 /* We only need to prefix "globally" visible variables. These include
7812 any variable marked with DW_AT_external or any variable that
7813 lives in a namespace. [Variables in anonymous namespaces
7814 require prefixing, but they are not DW_AT_external.] */
7816 if (dwarf2_attr (die, DW_AT_specification, cu))
7818 struct dwarf2_cu *spec_cu = cu;
7820 return die_needs_namespace (die_specification (die, &spec_cu),
7824 attr = dwarf2_attr (die, DW_AT_external, cu);
7825 if (attr == NULL && die->parent->tag != DW_TAG_namespace
7826 && die->parent->tag != DW_TAG_module)
7828 /* A variable in a lexical block of some kind does not need a
7829 namespace, even though in C++ such variables may be external
7830 and have a mangled name. */
7831 if (die->parent->tag == DW_TAG_lexical_block
7832 || die->parent->tag == DW_TAG_try_block
7833 || die->parent->tag == DW_TAG_catch_block
7834 || die->parent->tag == DW_TAG_subprogram)
7843 /* Retrieve the last character from a mem_file. */
7846 do_ui_file_peek_last (void *object, const char *buffer, long length)
7848 char *last_char_p = (char *) object;
7851 *last_char_p = buffer[length - 1];
7854 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
7855 compute the physname for the object, which include a method's:
7856 - formal parameters (C++/Java),
7857 - receiver type (Go),
7858 - return type (Java).
7860 The term "physname" is a bit confusing.
7861 For C++, for example, it is the demangled name.
7862 For Go, for example, it's the mangled name.
7864 For Ada, return the DIE's linkage name rather than the fully qualified
7865 name. PHYSNAME is ignored..
7867 The result is allocated on the objfile_obstack and canonicalized. */
7870 dwarf2_compute_name (const char *name,
7871 struct die_info *die, struct dwarf2_cu *cu,
7874 struct objfile *objfile = cu->objfile;
7877 name = dwarf2_name (die, cu);
7879 /* For Fortran GDB prefers DW_AT_*linkage_name if present but otherwise
7880 compute it by typename_concat inside GDB. */
7881 if (cu->language == language_ada
7882 || (cu->language == language_fortran && physname))
7884 /* For Ada unit, we prefer the linkage name over the name, as
7885 the former contains the exported name, which the user expects
7886 to be able to reference. Ideally, we want the user to be able
7887 to reference this entity using either natural or linkage name,
7888 but we haven't started looking at this enhancement yet. */
7889 struct attribute *attr;
7891 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
7893 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
7894 if (attr && DW_STRING (attr))
7895 return DW_STRING (attr);
7898 /* These are the only languages we know how to qualify names in. */
7900 && (cu->language == language_cplus || cu->language == language_java
7901 || cu->language == language_fortran))
7903 if (die_needs_namespace (die, cu))
7907 struct ui_file *buf;
7909 prefix = determine_prefix (die, cu);
7910 buf = mem_fileopen ();
7911 if (*prefix != '\0')
7913 char *prefixed_name = typename_concat (NULL, prefix, name,
7916 fputs_unfiltered (prefixed_name, buf);
7917 xfree (prefixed_name);
7920 fputs_unfiltered (name, buf);
7922 /* Template parameters may be specified in the DIE's DW_AT_name, or
7923 as children with DW_TAG_template_type_param or
7924 DW_TAG_value_type_param. If the latter, add them to the name
7925 here. If the name already has template parameters, then
7926 skip this step; some versions of GCC emit both, and
7927 it is more efficient to use the pre-computed name.
7929 Something to keep in mind about this process: it is very
7930 unlikely, or in some cases downright impossible, to produce
7931 something that will match the mangled name of a function.
7932 If the definition of the function has the same debug info,
7933 we should be able to match up with it anyway. But fallbacks
7934 using the minimal symbol, for instance to find a method
7935 implemented in a stripped copy of libstdc++, will not work.
7936 If we do not have debug info for the definition, we will have to
7937 match them up some other way.
7939 When we do name matching there is a related problem with function
7940 templates; two instantiated function templates are allowed to
7941 differ only by their return types, which we do not add here. */
7943 if (cu->language == language_cplus && strchr (name, '<') == NULL)
7945 struct attribute *attr;
7946 struct die_info *child;
7949 die->building_fullname = 1;
7951 for (child = die->child; child != NULL; child = child->sibling)
7955 const gdb_byte *bytes;
7956 struct dwarf2_locexpr_baton *baton;
7959 if (child->tag != DW_TAG_template_type_param
7960 && child->tag != DW_TAG_template_value_param)
7965 fputs_unfiltered ("<", buf);
7969 fputs_unfiltered (", ", buf);
7971 attr = dwarf2_attr (child, DW_AT_type, cu);
7974 complaint (&symfile_complaints,
7975 _("template parameter missing DW_AT_type"));
7976 fputs_unfiltered ("UNKNOWN_TYPE", buf);
7979 type = die_type (child, cu);
7981 if (child->tag == DW_TAG_template_type_param)
7983 c_print_type (type, "", buf, -1, 0, &type_print_raw_options);
7987 attr = dwarf2_attr (child, DW_AT_const_value, cu);
7990 complaint (&symfile_complaints,
7991 _("template parameter missing "
7992 "DW_AT_const_value"));
7993 fputs_unfiltered ("UNKNOWN_VALUE", buf);
7997 dwarf2_const_value_attr (attr, type, name,
7998 &cu->comp_unit_obstack, cu,
7999 &value, &bytes, &baton);
8001 if (TYPE_NOSIGN (type))
8002 /* GDB prints characters as NUMBER 'CHAR'. If that's
8003 changed, this can use value_print instead. */
8004 c_printchar (value, type, buf);
8007 struct value_print_options opts;
8010 v = dwarf2_evaluate_loc_desc (type, NULL,
8014 else if (bytes != NULL)
8016 v = allocate_value (type);
8017 memcpy (value_contents_writeable (v), bytes,
8018 TYPE_LENGTH (type));
8021 v = value_from_longest (type, value);
8023 /* Specify decimal so that we do not depend on
8025 get_formatted_print_options (&opts, 'd');
8027 value_print (v, buf, &opts);
8033 die->building_fullname = 0;
8037 /* Close the argument list, with a space if necessary
8038 (nested templates). */
8039 char last_char = '\0';
8040 ui_file_put (buf, do_ui_file_peek_last, &last_char);
8041 if (last_char == '>')
8042 fputs_unfiltered (" >", buf);
8044 fputs_unfiltered (">", buf);
8048 /* For Java and C++ methods, append formal parameter type
8049 information, if PHYSNAME. */
8051 if (physname && die->tag == DW_TAG_subprogram
8052 && (cu->language == language_cplus
8053 || cu->language == language_java))
8055 struct type *type = read_type_die (die, cu);
8057 c_type_print_args (type, buf, 1, cu->language,
8058 &type_print_raw_options);
8060 if (cu->language == language_java)
8062 /* For java, we must append the return type to method
8064 if (die->tag == DW_TAG_subprogram)
8065 java_print_type (TYPE_TARGET_TYPE (type), "", buf,
8066 0, 0, &type_print_raw_options);
8068 else if (cu->language == language_cplus)
8070 /* Assume that an artificial first parameter is
8071 "this", but do not crash if it is not. RealView
8072 marks unnamed (and thus unused) parameters as
8073 artificial; there is no way to differentiate
8075 if (TYPE_NFIELDS (type) > 0
8076 && TYPE_FIELD_ARTIFICIAL (type, 0)
8077 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
8078 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
8080 fputs_unfiltered (" const", buf);
8084 name = ui_file_obsavestring (buf, &objfile->objfile_obstack,
8086 ui_file_delete (buf);
8088 if (cu->language == language_cplus)
8091 = dwarf2_canonicalize_name (name, cu,
8092 &objfile->objfile_obstack);
8103 /* Return the fully qualified name of DIE, based on its DW_AT_name.
8104 If scope qualifiers are appropriate they will be added. The result
8105 will be allocated on the objfile_obstack, or NULL if the DIE does
8106 not have a name. NAME may either be from a previous call to
8107 dwarf2_name or NULL.
8109 The output string will be canonicalized (if C++/Java). */
8112 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
8114 return dwarf2_compute_name (name, die, cu, 0);
8117 /* Construct a physname for the given DIE in CU. NAME may either be
8118 from a previous call to dwarf2_name or NULL. The result will be
8119 allocated on the objfile_objstack or NULL if the DIE does not have a
8122 The output string will be canonicalized (if C++/Java). */
8125 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
8127 struct objfile *objfile = cu->objfile;
8128 struct attribute *attr;
8129 const char *retval, *mangled = NULL, *canon = NULL;
8130 struct cleanup *back_to;
8133 /* In this case dwarf2_compute_name is just a shortcut not building anything
8135 if (!die_needs_namespace (die, cu))
8136 return dwarf2_compute_name (name, die, cu, 1);
8138 back_to = make_cleanup (null_cleanup, NULL);
8140 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
8142 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
8144 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
8146 if (attr && DW_STRING (attr))
8150 mangled = DW_STRING (attr);
8152 /* Use DMGL_RET_DROP for C++ template functions to suppress their return
8153 type. It is easier for GDB users to search for such functions as
8154 `name(params)' than `long name(params)'. In such case the minimal
8155 symbol names do not match the full symbol names but for template
8156 functions there is never a need to look up their definition from their
8157 declaration so the only disadvantage remains the minimal symbol
8158 variant `long name(params)' does not have the proper inferior type.
8161 if (cu->language == language_go)
8163 /* This is a lie, but we already lie to the caller new_symbol_full.
8164 new_symbol_full assumes we return the mangled name.
8165 This just undoes that lie until things are cleaned up. */
8170 demangled = gdb_demangle (mangled,
8171 (DMGL_PARAMS | DMGL_ANSI
8172 | (cu->language == language_java
8173 ? DMGL_JAVA | DMGL_RET_POSTFIX
8178 make_cleanup (xfree, demangled);
8188 if (canon == NULL || check_physname)
8190 const char *physname = dwarf2_compute_name (name, die, cu, 1);
8192 if (canon != NULL && strcmp (physname, canon) != 0)
8194 /* It may not mean a bug in GDB. The compiler could also
8195 compute DW_AT_linkage_name incorrectly. But in such case
8196 GDB would need to be bug-to-bug compatible. */
8198 complaint (&symfile_complaints,
8199 _("Computed physname <%s> does not match demangled <%s> "
8200 "(from linkage <%s>) - DIE at 0x%x [in module %s]"),
8201 physname, canon, mangled, die->offset.sect_off,
8202 objfile_name (objfile));
8204 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
8205 is available here - over computed PHYSNAME. It is safer
8206 against both buggy GDB and buggy compilers. */
8220 retval = obstack_copy0 (&objfile->objfile_obstack, retval, strlen (retval));
8222 do_cleanups (back_to);
8226 /* Read the import statement specified by the given die and record it. */
8229 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
8231 struct objfile *objfile = cu->objfile;
8232 struct attribute *import_attr;
8233 struct die_info *imported_die, *child_die;
8234 struct dwarf2_cu *imported_cu;
8235 const char *imported_name;
8236 const char *imported_name_prefix;
8237 const char *canonical_name;
8238 const char *import_alias;
8239 const char *imported_declaration = NULL;
8240 const char *import_prefix;
8241 VEC (const_char_ptr) *excludes = NULL;
8242 struct cleanup *cleanups;
8244 import_attr = dwarf2_attr (die, DW_AT_import, cu);
8245 if (import_attr == NULL)
8247 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
8248 dwarf_tag_name (die->tag));
8253 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
8254 imported_name = dwarf2_name (imported_die, imported_cu);
8255 if (imported_name == NULL)
8257 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
8259 The import in the following code:
8273 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
8274 <52> DW_AT_decl_file : 1
8275 <53> DW_AT_decl_line : 6
8276 <54> DW_AT_import : <0x75>
8277 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
8279 <5b> DW_AT_decl_file : 1
8280 <5c> DW_AT_decl_line : 2
8281 <5d> DW_AT_type : <0x6e>
8283 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
8284 <76> DW_AT_byte_size : 4
8285 <77> DW_AT_encoding : 5 (signed)
8287 imports the wrong die ( 0x75 instead of 0x58 ).
8288 This case will be ignored until the gcc bug is fixed. */
8292 /* Figure out the local name after import. */
8293 import_alias = dwarf2_name (die, cu);
8295 /* Figure out where the statement is being imported to. */
8296 import_prefix = determine_prefix (die, cu);
8298 /* Figure out what the scope of the imported die is and prepend it
8299 to the name of the imported die. */
8300 imported_name_prefix = determine_prefix (imported_die, imported_cu);
8302 if (imported_die->tag != DW_TAG_namespace
8303 && imported_die->tag != DW_TAG_module)
8305 imported_declaration = imported_name;
8306 canonical_name = imported_name_prefix;
8308 else if (strlen (imported_name_prefix) > 0)
8309 canonical_name = obconcat (&objfile->objfile_obstack,
8310 imported_name_prefix, "::", imported_name,
8313 canonical_name = imported_name;
8315 cleanups = make_cleanup (VEC_cleanup (const_char_ptr), &excludes);
8317 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
8318 for (child_die = die->child; child_die && child_die->tag;
8319 child_die = sibling_die (child_die))
8321 /* DWARF-4: A Fortran use statement with a “rename list” may be
8322 represented by an imported module entry with an import attribute
8323 referring to the module and owned entries corresponding to those
8324 entities that are renamed as part of being imported. */
8326 if (child_die->tag != DW_TAG_imported_declaration)
8328 complaint (&symfile_complaints,
8329 _("child DW_TAG_imported_declaration expected "
8330 "- DIE at 0x%x [in module %s]"),
8331 child_die->offset.sect_off, objfile_name (objfile));
8335 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
8336 if (import_attr == NULL)
8338 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
8339 dwarf_tag_name (child_die->tag));
8344 imported_die = follow_die_ref_or_sig (child_die, import_attr,
8346 imported_name = dwarf2_name (imported_die, imported_cu);
8347 if (imported_name == NULL)
8349 complaint (&symfile_complaints,
8350 _("child DW_TAG_imported_declaration has unknown "
8351 "imported name - DIE at 0x%x [in module %s]"),
8352 child_die->offset.sect_off, objfile_name (objfile));
8356 VEC_safe_push (const_char_ptr, excludes, imported_name);
8358 process_die (child_die, cu);
8361 cp_add_using_directive (import_prefix,
8364 imported_declaration,
8367 &objfile->objfile_obstack);
8369 do_cleanups (cleanups);
8372 /* Cleanup function for handle_DW_AT_stmt_list. */
8375 free_cu_line_header (void *arg)
8377 struct dwarf2_cu *cu = arg;
8379 free_line_header (cu->line_header);
8380 cu->line_header = NULL;
8383 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
8384 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
8385 this, it was first present in GCC release 4.3.0. */
8388 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
8390 if (!cu->checked_producer)
8391 check_producer (cu);
8393 return cu->producer_is_gcc_lt_4_3;
8397 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu,
8398 const char **name, const char **comp_dir)
8400 struct attribute *attr;
8405 /* Find the filename. Do not use dwarf2_name here, since the filename
8406 is not a source language identifier. */
8407 attr = dwarf2_attr (die, DW_AT_name, cu);
8410 *name = DW_STRING (attr);
8413 attr = dwarf2_attr (die, DW_AT_comp_dir, cu);
8415 *comp_dir = DW_STRING (attr);
8416 else if (producer_is_gcc_lt_4_3 (cu) && *name != NULL
8417 && IS_ABSOLUTE_PATH (*name))
8419 char *d = ldirname (*name);
8423 make_cleanup (xfree, d);
8425 if (*comp_dir != NULL)
8427 /* Irix 6.2 native cc prepends <machine>.: to the compilation
8428 directory, get rid of it. */
8429 char *cp = strchr (*comp_dir, ':');
8431 if (cp && cp != *comp_dir && cp[-1] == '.' && cp[1] == '/')
8436 *name = "<unknown>";
8439 /* Handle DW_AT_stmt_list for a compilation unit.
8440 DIE is the DW_TAG_compile_unit die for CU.
8441 COMP_DIR is the compilation directory.
8442 WANT_LINE_INFO is non-zero if the pc/line-number mapping is needed. */
8445 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
8446 const char *comp_dir) /* ARI: editCase function */
8448 struct attribute *attr;
8450 gdb_assert (! cu->per_cu->is_debug_types);
8452 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
8455 unsigned int line_offset = DW_UNSND (attr);
8456 struct line_header *line_header
8457 = dwarf_decode_line_header (line_offset, cu);
8461 cu->line_header = line_header;
8462 make_cleanup (free_cu_line_header, cu);
8463 dwarf_decode_lines (line_header, comp_dir, cu, NULL, 1);
8468 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
8471 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
8473 struct objfile *objfile = dwarf2_per_objfile->objfile;
8474 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
8475 CORE_ADDR lowpc = ((CORE_ADDR) -1);
8476 CORE_ADDR highpc = ((CORE_ADDR) 0);
8477 struct attribute *attr;
8478 const char *name = NULL;
8479 const char *comp_dir = NULL;
8480 struct die_info *child_die;
8481 bfd *abfd = objfile->obfd;
8484 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8486 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
8488 /* If we didn't find a lowpc, set it to highpc to avoid complaints
8489 from finish_block. */
8490 if (lowpc == ((CORE_ADDR) -1))
8495 find_file_and_directory (die, cu, &name, &comp_dir);
8497 prepare_one_comp_unit (cu, die, cu->language);
8499 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
8500 standardised yet. As a workaround for the language detection we fall
8501 back to the DW_AT_producer string. */
8502 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
8503 cu->language = language_opencl;
8505 /* Similar hack for Go. */
8506 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
8507 set_cu_language (DW_LANG_Go, cu);
8509 dwarf2_start_symtab (cu, name, comp_dir, lowpc);
8511 /* Decode line number information if present. We do this before
8512 processing child DIEs, so that the line header table is available
8513 for DW_AT_decl_file. */
8514 handle_DW_AT_stmt_list (die, cu, comp_dir);
8516 /* Process all dies in compilation unit. */
8517 if (die->child != NULL)
8519 child_die = die->child;
8520 while (child_die && child_die->tag)
8522 process_die (child_die, cu);
8523 child_die = sibling_die (child_die);
8527 /* Decode macro information, if present. Dwarf 2 macro information
8528 refers to information in the line number info statement program
8529 header, so we can only read it if we've read the header
8531 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
8532 if (attr && cu->line_header)
8534 if (dwarf2_attr (die, DW_AT_macro_info, cu))
8535 complaint (&symfile_complaints,
8536 _("CU refers to both DW_AT_GNU_macros and DW_AT_macro_info"));
8538 dwarf_decode_macros (cu, DW_UNSND (attr), comp_dir, 1);
8542 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
8543 if (attr && cu->line_header)
8545 unsigned int macro_offset = DW_UNSND (attr);
8547 dwarf_decode_macros (cu, macro_offset, comp_dir, 0);
8551 do_cleanups (back_to);
8554 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
8555 Create the set of symtabs used by this TU, or if this TU is sharing
8556 symtabs with another TU and the symtabs have already been created
8557 then restore those symtabs in the line header.
8558 We don't need the pc/line-number mapping for type units. */
8561 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
8563 struct objfile *objfile = dwarf2_per_objfile->objfile;
8564 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
8565 struct type_unit_group *tu_group;
8567 struct line_header *lh;
8568 struct attribute *attr;
8569 unsigned int i, line_offset;
8570 struct signatured_type *sig_type;
8572 gdb_assert (per_cu->is_debug_types);
8573 sig_type = (struct signatured_type *) per_cu;
8575 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
8577 /* If we're using .gdb_index (includes -readnow) then
8578 per_cu->type_unit_group may not have been set up yet. */
8579 if (sig_type->type_unit_group == NULL)
8580 sig_type->type_unit_group = get_type_unit_group (cu, attr);
8581 tu_group = sig_type->type_unit_group;
8583 /* If we've already processed this stmt_list there's no real need to
8584 do it again, we could fake it and just recreate the part we need
8585 (file name,index -> symtab mapping). If data shows this optimization
8586 is useful we can do it then. */
8587 first_time = tu_group->primary_symtab == NULL;
8589 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
8594 line_offset = DW_UNSND (attr);
8595 lh = dwarf_decode_line_header (line_offset, cu);
8600 dwarf2_start_symtab (cu, "", NULL, 0);
8603 gdb_assert (tu_group->symtabs == NULL);
8606 /* Note: The primary symtab will get allocated at the end. */
8610 cu->line_header = lh;
8611 make_cleanup (free_cu_line_header, cu);
8615 dwarf2_start_symtab (cu, "", NULL, 0);
8617 tu_group->num_symtabs = lh->num_file_names;
8618 tu_group->symtabs = XNEWVEC (struct symtab *, lh->num_file_names);
8620 for (i = 0; i < lh->num_file_names; ++i)
8622 const char *dir = NULL;
8623 struct file_entry *fe = &lh->file_names[i];
8626 dir = lh->include_dirs[fe->dir_index - 1];
8627 dwarf2_start_subfile (fe->name, dir, NULL);
8629 /* Note: We don't have to watch for the main subfile here, type units
8630 don't have DW_AT_name. */
8632 if (current_subfile->symtab == NULL)
8634 /* NOTE: start_subfile will recognize when it's been passed
8635 a file it has already seen. So we can't assume there's a
8636 simple mapping from lh->file_names to subfiles,
8637 lh->file_names may contain dups. */
8638 current_subfile->symtab = allocate_symtab (current_subfile->name,
8642 fe->symtab = current_subfile->symtab;
8643 tu_group->symtabs[i] = fe->symtab;
8650 for (i = 0; i < lh->num_file_names; ++i)
8652 struct file_entry *fe = &lh->file_names[i];
8654 fe->symtab = tu_group->symtabs[i];
8658 /* The main symtab is allocated last. Type units don't have DW_AT_name
8659 so they don't have a "real" (so to speak) symtab anyway.
8660 There is later code that will assign the main symtab to all symbols
8661 that don't have one. We need to handle the case of a symbol with a
8662 missing symtab (DW_AT_decl_file) anyway. */
8665 /* Process DW_TAG_type_unit.
8666 For TUs we want to skip the first top level sibling if it's not the
8667 actual type being defined by this TU. In this case the first top
8668 level sibling is there to provide context only. */
8671 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
8673 struct die_info *child_die;
8675 prepare_one_comp_unit (cu, die, language_minimal);
8677 /* Initialize (or reinitialize) the machinery for building symtabs.
8678 We do this before processing child DIEs, so that the line header table
8679 is available for DW_AT_decl_file. */
8680 setup_type_unit_groups (die, cu);
8682 if (die->child != NULL)
8684 child_die = die->child;
8685 while (child_die && child_die->tag)
8687 process_die (child_die, cu);
8688 child_die = sibling_die (child_die);
8695 http://gcc.gnu.org/wiki/DebugFission
8696 http://gcc.gnu.org/wiki/DebugFissionDWP
8698 To simplify handling of both DWO files ("object" files with the DWARF info)
8699 and DWP files (a file with the DWOs packaged up into one file), we treat
8700 DWP files as having a collection of virtual DWO files. */
8703 hash_dwo_file (const void *item)
8705 const struct dwo_file *dwo_file = item;
8708 hash = htab_hash_string (dwo_file->dwo_name);
8709 if (dwo_file->comp_dir != NULL)
8710 hash += htab_hash_string (dwo_file->comp_dir);
8715 eq_dwo_file (const void *item_lhs, const void *item_rhs)
8717 const struct dwo_file *lhs = item_lhs;
8718 const struct dwo_file *rhs = item_rhs;
8720 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
8722 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
8723 return lhs->comp_dir == rhs->comp_dir;
8724 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
8727 /* Allocate a hash table for DWO files. */
8730 allocate_dwo_file_hash_table (void)
8732 struct objfile *objfile = dwarf2_per_objfile->objfile;
8734 return htab_create_alloc_ex (41,
8738 &objfile->objfile_obstack,
8739 hashtab_obstack_allocate,
8740 dummy_obstack_deallocate);
8743 /* Lookup DWO file DWO_NAME. */
8746 lookup_dwo_file_slot (const char *dwo_name, const char *comp_dir)
8748 struct dwo_file find_entry;
8751 if (dwarf2_per_objfile->dwo_files == NULL)
8752 dwarf2_per_objfile->dwo_files = allocate_dwo_file_hash_table ();
8754 memset (&find_entry, 0, sizeof (find_entry));
8755 find_entry.dwo_name = dwo_name;
8756 find_entry.comp_dir = comp_dir;
8757 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
8763 hash_dwo_unit (const void *item)
8765 const struct dwo_unit *dwo_unit = item;
8767 /* This drops the top 32 bits of the id, but is ok for a hash. */
8768 return dwo_unit->signature;
8772 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
8774 const struct dwo_unit *lhs = item_lhs;
8775 const struct dwo_unit *rhs = item_rhs;
8777 /* The signature is assumed to be unique within the DWO file.
8778 So while object file CU dwo_id's always have the value zero,
8779 that's OK, assuming each object file DWO file has only one CU,
8780 and that's the rule for now. */
8781 return lhs->signature == rhs->signature;
8784 /* Allocate a hash table for DWO CUs,TUs.
8785 There is one of these tables for each of CUs,TUs for each DWO file. */
8788 allocate_dwo_unit_table (struct objfile *objfile)
8790 /* Start out with a pretty small number.
8791 Generally DWO files contain only one CU and maybe some TUs. */
8792 return htab_create_alloc_ex (3,
8796 &objfile->objfile_obstack,
8797 hashtab_obstack_allocate,
8798 dummy_obstack_deallocate);
8801 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
8803 struct create_dwo_cu_data
8805 struct dwo_file *dwo_file;
8806 struct dwo_unit dwo_unit;
8809 /* die_reader_func for create_dwo_cu. */
8812 create_dwo_cu_reader (const struct die_reader_specs *reader,
8813 const gdb_byte *info_ptr,
8814 struct die_info *comp_unit_die,
8818 struct dwarf2_cu *cu = reader->cu;
8819 struct objfile *objfile = dwarf2_per_objfile->objfile;
8820 sect_offset offset = cu->per_cu->offset;
8821 struct dwarf2_section_info *section = cu->per_cu->section;
8822 struct create_dwo_cu_data *data = datap;
8823 struct dwo_file *dwo_file = data->dwo_file;
8824 struct dwo_unit *dwo_unit = &data->dwo_unit;
8825 struct attribute *attr;
8827 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
8830 complaint (&symfile_complaints,
8831 _("Dwarf Error: debug entry at offset 0x%x is missing"
8832 " its dwo_id [in module %s]"),
8833 offset.sect_off, dwo_file->dwo_name);
8837 dwo_unit->dwo_file = dwo_file;
8838 dwo_unit->signature = DW_UNSND (attr);
8839 dwo_unit->section = section;
8840 dwo_unit->offset = offset;
8841 dwo_unit->length = cu->per_cu->length;
8843 if (dwarf2_read_debug)
8844 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, dwo_id %s\n",
8845 offset.sect_off, hex_string (dwo_unit->signature));
8848 /* Create the dwo_unit for the lone CU in DWO_FILE.
8849 Note: This function processes DWO files only, not DWP files. */
8851 static struct dwo_unit *
8852 create_dwo_cu (struct dwo_file *dwo_file)
8854 struct objfile *objfile = dwarf2_per_objfile->objfile;
8855 struct dwarf2_section_info *section = &dwo_file->sections.info;
8858 const gdb_byte *info_ptr, *end_ptr;
8859 struct create_dwo_cu_data create_dwo_cu_data;
8860 struct dwo_unit *dwo_unit;
8862 dwarf2_read_section (objfile, section);
8863 info_ptr = section->buffer;
8865 if (info_ptr == NULL)
8868 /* We can't set abfd until now because the section may be empty or
8869 not present, in which case section->asection will be NULL. */
8870 abfd = section->asection->owner;
8872 if (dwarf2_read_debug)
8874 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
8875 bfd_section_name (abfd, section->asection),
8876 bfd_get_filename (abfd));
8879 create_dwo_cu_data.dwo_file = dwo_file;
8882 end_ptr = info_ptr + section->size;
8883 while (info_ptr < end_ptr)
8885 struct dwarf2_per_cu_data per_cu;
8887 memset (&create_dwo_cu_data.dwo_unit, 0,
8888 sizeof (create_dwo_cu_data.dwo_unit));
8889 memset (&per_cu, 0, sizeof (per_cu));
8890 per_cu.objfile = objfile;
8891 per_cu.is_debug_types = 0;
8892 per_cu.offset.sect_off = info_ptr - section->buffer;
8893 per_cu.section = section;
8895 init_cutu_and_read_dies_no_follow (&per_cu,
8896 &dwo_file->sections.abbrev,
8898 create_dwo_cu_reader,
8899 &create_dwo_cu_data);
8901 if (create_dwo_cu_data.dwo_unit.dwo_file != NULL)
8903 /* If we've already found one, complain. We only support one
8904 because having more than one requires hacking the dwo_name of
8905 each to match, which is highly unlikely to happen. */
8906 if (dwo_unit != NULL)
8908 complaint (&symfile_complaints,
8909 _("Multiple CUs in DWO file %s [in module %s]"),
8910 dwo_file->dwo_name, objfile_name (objfile));
8914 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
8915 *dwo_unit = create_dwo_cu_data.dwo_unit;
8918 info_ptr += per_cu.length;
8924 /* DWP file .debug_{cu,tu}_index section format:
8925 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
8929 Both index sections have the same format, and serve to map a 64-bit
8930 signature to a set of section numbers. Each section begins with a header,
8931 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
8932 indexes, and a pool of 32-bit section numbers. The index sections will be
8933 aligned at 8-byte boundaries in the file.
8935 The index section header consists of:
8937 V, 32 bit version number
8939 N, 32 bit number of compilation units or type units in the index
8940 M, 32 bit number of slots in the hash table
8942 Numbers are recorded using the byte order of the application binary.
8944 We assume that N and M will not exceed 2^32 - 1.
8946 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
8948 The hash table begins at offset 16 in the section, and consists of an array
8949 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
8950 order of the application binary). Unused slots in the hash table are 0.
8951 (We rely on the extreme unlikeliness of a signature being exactly 0.)
8953 The parallel table begins immediately after the hash table
8954 (at offset 16 + 8 * M from the beginning of the section), and consists of an
8955 array of 32-bit indexes (using the byte order of the application binary),
8956 corresponding 1-1 with slots in the hash table. Each entry in the parallel
8957 table contains a 32-bit index into the pool of section numbers. For unused
8958 hash table slots, the corresponding entry in the parallel table will be 0.
8960 Given a 64-bit compilation unit signature or a type signature S, an entry
8961 in the hash table is located as follows:
8963 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
8964 the low-order k bits all set to 1.
8966 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
8968 3) If the hash table entry at index H matches the signature, use that
8969 entry. If the hash table entry at index H is unused (all zeroes),
8970 terminate the search: the signature is not present in the table.
8972 4) Let H = (H + H') modulo M. Repeat at Step 3.
8974 Because M > N and H' and M are relatively prime, the search is guaranteed
8975 to stop at an unused slot or find the match.
8977 The pool of section numbers begins immediately following the hash table
8978 (at offset 16 + 12 * M from the beginning of the section). The pool of
8979 section numbers consists of an array of 32-bit words (using the byte order
8980 of the application binary). Each item in the array is indexed starting
8981 from 0. The hash table entry provides the index of the first section
8982 number in the set. Additional section numbers in the set follow, and the
8983 set is terminated by a 0 entry (section number 0 is not used in ELF).
8985 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
8986 section must be the first entry in the set, and the .debug_abbrev.dwo must
8987 be the second entry. Other members of the set may follow in any order. */
8989 /* Create a hash table to map DWO IDs to their CU/TU entry in
8990 .debug_{info,types}.dwo in DWP_FILE.
8991 Returns NULL if there isn't one.
8992 Note: This function processes DWP files only, not DWO files. */
8994 static struct dwp_hash_table *
8995 create_dwp_hash_table (struct dwp_file *dwp_file, int is_debug_types)
8997 struct objfile *objfile = dwarf2_per_objfile->objfile;
8998 bfd *dbfd = dwp_file->dbfd;
8999 const gdb_byte *index_ptr, *index_end;
9000 struct dwarf2_section_info *index;
9001 uint32_t version, nr_units, nr_slots;
9002 struct dwp_hash_table *htab;
9005 index = &dwp_file->sections.tu_index;
9007 index = &dwp_file->sections.cu_index;
9009 if (dwarf2_section_empty_p (index))
9011 dwarf2_read_section (objfile, index);
9013 index_ptr = index->buffer;
9014 index_end = index_ptr + index->size;
9016 version = read_4_bytes (dbfd, index_ptr);
9017 index_ptr += 8; /* Skip the unused word. */
9018 nr_units = read_4_bytes (dbfd, index_ptr);
9020 nr_slots = read_4_bytes (dbfd, index_ptr);
9025 error (_("Dwarf Error: unsupported DWP file version (%s)"
9027 pulongest (version), dwp_file->name);
9029 if (nr_slots != (nr_slots & -nr_slots))
9031 error (_("Dwarf Error: number of slots in DWP hash table (%s)"
9032 " is not power of 2 [in module %s]"),
9033 pulongest (nr_slots), dwp_file->name);
9036 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
9037 htab->nr_units = nr_units;
9038 htab->nr_slots = nr_slots;
9039 htab->hash_table = index_ptr;
9040 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
9041 htab->section_pool = htab->unit_table + sizeof (uint32_t) * nr_slots;
9046 /* Update SECTIONS with the data from SECTP.
9048 This function is like the other "locate" section routines that are
9049 passed to bfd_map_over_sections, but in this context the sections to
9050 read comes from the DWP hash table, not the full ELF section table.
9052 The result is non-zero for success, or zero if an error was found. */
9055 locate_virtual_dwo_sections (asection *sectp,
9056 struct virtual_dwo_sections *sections)
9058 const struct dwop_section_names *names = &dwop_section_names;
9060 if (section_is_p (sectp->name, &names->abbrev_dwo))
9062 /* There can be only one. */
9063 if (sections->abbrev.asection != NULL)
9065 sections->abbrev.asection = sectp;
9066 sections->abbrev.size = bfd_get_section_size (sectp);
9068 else if (section_is_p (sectp->name, &names->info_dwo)
9069 || section_is_p (sectp->name, &names->types_dwo))
9071 /* There can be only one. */
9072 if (sections->info_or_types.asection != NULL)
9074 sections->info_or_types.asection = sectp;
9075 sections->info_or_types.size = bfd_get_section_size (sectp);
9077 else if (section_is_p (sectp->name, &names->line_dwo))
9079 /* There can be only one. */
9080 if (sections->line.asection != NULL)
9082 sections->line.asection = sectp;
9083 sections->line.size = bfd_get_section_size (sectp);
9085 else if (section_is_p (sectp->name, &names->loc_dwo))
9087 /* There can be only one. */
9088 if (sections->loc.asection != NULL)
9090 sections->loc.asection = sectp;
9091 sections->loc.size = bfd_get_section_size (sectp);
9093 else if (section_is_p (sectp->name, &names->macinfo_dwo))
9095 /* There can be only one. */
9096 if (sections->macinfo.asection != NULL)
9098 sections->macinfo.asection = sectp;
9099 sections->macinfo.size = bfd_get_section_size (sectp);
9101 else if (section_is_p (sectp->name, &names->macro_dwo))
9103 /* There can be only one. */
9104 if (sections->macro.asection != NULL)
9106 sections->macro.asection = sectp;
9107 sections->macro.size = bfd_get_section_size (sectp);
9109 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
9111 /* There can be only one. */
9112 if (sections->str_offsets.asection != NULL)
9114 sections->str_offsets.asection = sectp;
9115 sections->str_offsets.size = bfd_get_section_size (sectp);
9119 /* No other kind of section is valid. */
9126 /* Create a dwo_unit object for the DWO with signature SIGNATURE.
9127 HTAB is the hash table from the DWP file.
9128 SECTION_INDEX is the index of the DWO in HTAB.
9129 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU. */
9131 static struct dwo_unit *
9132 create_dwo_in_dwp (struct dwp_file *dwp_file,
9133 const struct dwp_hash_table *htab,
9134 uint32_t section_index,
9135 const char *comp_dir,
9136 ULONGEST signature, int is_debug_types)
9138 struct objfile *objfile = dwarf2_per_objfile->objfile;
9139 bfd *dbfd = dwp_file->dbfd;
9140 const char *kind = is_debug_types ? "TU" : "CU";
9141 struct dwo_file *dwo_file;
9142 struct dwo_unit *dwo_unit;
9143 struct virtual_dwo_sections sections;
9144 void **dwo_file_slot;
9145 char *virtual_dwo_name;
9146 struct dwarf2_section_info *cutu;
9147 struct cleanup *cleanups;
9150 if (dwarf2_read_debug)
9152 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP file: %s\n",
9154 pulongest (section_index), hex_string (signature),
9158 /* Fetch the sections of this DWO.
9159 Put a limit on the number of sections we look for so that bad data
9160 doesn't cause us to loop forever. */
9162 #define MAX_NR_DWO_SECTIONS \
9163 (1 /* .debug_info or .debug_types */ \
9164 + 1 /* .debug_abbrev */ \
9165 + 1 /* .debug_line */ \
9166 + 1 /* .debug_loc */ \
9167 + 1 /* .debug_str_offsets */ \
9168 + 1 /* .debug_macro */ \
9169 + 1 /* .debug_macinfo */ \
9170 + 1 /* trailing zero */)
9172 memset (§ions, 0, sizeof (sections));
9173 cleanups = make_cleanup (null_cleanup, 0);
9175 for (i = 0; i < MAX_NR_DWO_SECTIONS; ++i)
9178 uint32_t section_nr =
9181 + (section_index + i) * sizeof (uint32_t));
9183 if (section_nr == 0)
9185 if (section_nr >= dwp_file->num_sections)
9187 error (_("Dwarf Error: bad DWP hash table, section number too large"
9192 sectp = dwp_file->elf_sections[section_nr];
9193 if (! locate_virtual_dwo_sections (sectp, §ions))
9195 error (_("Dwarf Error: bad DWP hash table, invalid section found"
9202 || sections.info_or_types.asection == NULL
9203 || sections.abbrev.asection == NULL)
9205 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
9209 if (i == MAX_NR_DWO_SECTIONS)
9211 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
9216 /* It's easier for the rest of the code if we fake a struct dwo_file and
9217 have dwo_unit "live" in that. At least for now.
9219 The DWP file can be made up of a random collection of CUs and TUs.
9220 However, for each CU + set of TUs that came from the same original DWO
9221 file, we want to combine them back into a virtual DWO file to save space
9222 (fewer struct dwo_file objects to allocated). Remember that for really
9223 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
9226 xstrprintf ("virtual-dwo/%d-%d-%d-%d",
9227 sections.abbrev.asection ? sections.abbrev.asection->id : 0,
9228 sections.line.asection ? sections.line.asection->id : 0,
9229 sections.loc.asection ? sections.loc.asection->id : 0,
9230 (sections.str_offsets.asection
9231 ? sections.str_offsets.asection->id
9233 make_cleanup (xfree, virtual_dwo_name);
9234 /* Can we use an existing virtual DWO file? */
9235 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name, comp_dir);
9236 /* Create one if necessary. */
9237 if (*dwo_file_slot == NULL)
9239 if (dwarf2_read_debug)
9241 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
9244 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
9245 dwo_file->dwo_name = obstack_copy0 (&objfile->objfile_obstack,
9247 strlen (virtual_dwo_name));
9248 dwo_file->comp_dir = comp_dir;
9249 dwo_file->sections.abbrev = sections.abbrev;
9250 dwo_file->sections.line = sections.line;
9251 dwo_file->sections.loc = sections.loc;
9252 dwo_file->sections.macinfo = sections.macinfo;
9253 dwo_file->sections.macro = sections.macro;
9254 dwo_file->sections.str_offsets = sections.str_offsets;
9255 /* The "str" section is global to the entire DWP file. */
9256 dwo_file->sections.str = dwp_file->sections.str;
9257 /* The info or types section is assigned later to dwo_unit,
9258 there's no need to record it in dwo_file.
9259 Also, we can't simply record type sections in dwo_file because
9260 we record a pointer into the vector in dwo_unit. As we collect more
9261 types we'll grow the vector and eventually have to reallocate space
9262 for it, invalidating all the pointers into the current copy. */
9263 *dwo_file_slot = dwo_file;
9267 if (dwarf2_read_debug)
9269 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
9272 dwo_file = *dwo_file_slot;
9274 do_cleanups (cleanups);
9276 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
9277 dwo_unit->dwo_file = dwo_file;
9278 dwo_unit->signature = signature;
9279 dwo_unit->section = obstack_alloc (&objfile->objfile_obstack,
9280 sizeof (struct dwarf2_section_info));
9281 *dwo_unit->section = sections.info_or_types;
9282 /* offset, length, type_offset_in_tu are set later. */
9287 /* Lookup the DWO with SIGNATURE in DWP_FILE. */
9289 static struct dwo_unit *
9290 lookup_dwo_in_dwp (struct dwp_file *dwp_file,
9291 const struct dwp_hash_table *htab,
9292 const char *comp_dir,
9293 ULONGEST signature, int is_debug_types)
9295 bfd *dbfd = dwp_file->dbfd;
9296 uint32_t mask = htab->nr_slots - 1;
9297 uint32_t hash = signature & mask;
9298 uint32_t hash2 = ((signature >> 32) & mask) | 1;
9301 struct dwo_unit find_dwo_cu, *dwo_cu;
9303 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
9304 find_dwo_cu.signature = signature;
9305 slot = htab_find_slot (dwp_file->loaded_cutus, &find_dwo_cu, INSERT);
9310 /* Use a for loop so that we don't loop forever on bad debug info. */
9311 for (i = 0; i < htab->nr_slots; ++i)
9313 ULONGEST signature_in_table;
9315 signature_in_table =
9316 read_8_bytes (dbfd, htab->hash_table + hash * sizeof (uint64_t));
9317 if (signature_in_table == signature)
9319 uint32_t section_index =
9320 read_4_bytes (dbfd, htab->unit_table + hash * sizeof (uint32_t));
9322 *slot = create_dwo_in_dwp (dwp_file, htab, section_index,
9323 comp_dir, signature, is_debug_types);
9326 if (signature_in_table == 0)
9328 hash = (hash + hash2) & mask;
9331 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
9336 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
9337 Open the file specified by FILE_NAME and hand it off to BFD for
9338 preliminary analysis. Return a newly initialized bfd *, which
9339 includes a canonicalized copy of FILE_NAME.
9340 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
9341 SEARCH_CWD is true if the current directory is to be searched.
9342 It will be searched before debug-file-directory.
9343 If unable to find/open the file, return NULL.
9344 NOTE: This function is derived from symfile_bfd_open. */
9347 try_open_dwop_file (const char *file_name, int is_dwp, int search_cwd)
9351 char *absolute_name;
9352 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
9353 FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
9354 to debug_file_directory. */
9356 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
9360 if (*debug_file_directory != '\0')
9361 search_path = concat (".", dirname_separator_string,
9362 debug_file_directory, NULL);
9364 search_path = xstrdup (".");
9367 search_path = xstrdup (debug_file_directory);
9369 flags = OPF_RETURN_REALPATH;
9371 flags |= OPF_SEARCH_IN_PATH;
9372 desc = openp (search_path, flags, file_name,
9373 O_RDONLY | O_BINARY, &absolute_name);
9374 xfree (search_path);
9378 sym_bfd = gdb_bfd_open (absolute_name, gnutarget, desc);
9379 xfree (absolute_name);
9380 if (sym_bfd == NULL)
9382 bfd_set_cacheable (sym_bfd, 1);
9384 if (!bfd_check_format (sym_bfd, bfd_object))
9386 gdb_bfd_unref (sym_bfd); /* This also closes desc. */
9393 /* Try to open DWO file FILE_NAME.
9394 COMP_DIR is the DW_AT_comp_dir attribute.
9395 The result is the bfd handle of the file.
9396 If there is a problem finding or opening the file, return NULL.
9397 Upon success, the canonicalized path of the file is stored in the bfd,
9398 same as symfile_bfd_open. */
9401 open_dwo_file (const char *file_name, const char *comp_dir)
9405 if (IS_ABSOLUTE_PATH (file_name))
9406 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 0 /*search_cwd*/);
9408 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
9410 if (comp_dir != NULL)
9412 char *path_to_try = concat (comp_dir, SLASH_STRING, file_name, NULL);
9414 /* NOTE: If comp_dir is a relative path, this will also try the
9415 search path, which seems useful. */
9416 abfd = try_open_dwop_file (path_to_try, 0 /*is_dwp*/, 1 /*search_cwd*/);
9417 xfree (path_to_try);
9422 /* That didn't work, try debug-file-directory, which, despite its name,
9423 is a list of paths. */
9425 if (*debug_file_directory == '\0')
9428 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 1 /*search_cwd*/);
9431 /* This function is mapped across the sections and remembers the offset and
9432 size of each of the DWO debugging sections we are interested in. */
9435 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
9437 struct dwo_sections *dwo_sections = dwo_sections_ptr;
9438 const struct dwop_section_names *names = &dwop_section_names;
9440 if (section_is_p (sectp->name, &names->abbrev_dwo))
9442 dwo_sections->abbrev.asection = sectp;
9443 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
9445 else if (section_is_p (sectp->name, &names->info_dwo))
9447 dwo_sections->info.asection = sectp;
9448 dwo_sections->info.size = bfd_get_section_size (sectp);
9450 else if (section_is_p (sectp->name, &names->line_dwo))
9452 dwo_sections->line.asection = sectp;
9453 dwo_sections->line.size = bfd_get_section_size (sectp);
9455 else if (section_is_p (sectp->name, &names->loc_dwo))
9457 dwo_sections->loc.asection = sectp;
9458 dwo_sections->loc.size = bfd_get_section_size (sectp);
9460 else if (section_is_p (sectp->name, &names->macinfo_dwo))
9462 dwo_sections->macinfo.asection = sectp;
9463 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
9465 else if (section_is_p (sectp->name, &names->macro_dwo))
9467 dwo_sections->macro.asection = sectp;
9468 dwo_sections->macro.size = bfd_get_section_size (sectp);
9470 else if (section_is_p (sectp->name, &names->str_dwo))
9472 dwo_sections->str.asection = sectp;
9473 dwo_sections->str.size = bfd_get_section_size (sectp);
9475 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
9477 dwo_sections->str_offsets.asection = sectp;
9478 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
9480 else if (section_is_p (sectp->name, &names->types_dwo))
9482 struct dwarf2_section_info type_section;
9484 memset (&type_section, 0, sizeof (type_section));
9485 type_section.asection = sectp;
9486 type_section.size = bfd_get_section_size (sectp);
9487 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
9492 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
9493 by PER_CU. This is for the non-DWP case.
9494 The result is NULL if DWO_NAME can't be found. */
9496 static struct dwo_file *
9497 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
9498 const char *dwo_name, const char *comp_dir)
9500 struct objfile *objfile = dwarf2_per_objfile->objfile;
9501 struct dwo_file *dwo_file;
9503 struct cleanup *cleanups;
9505 dbfd = open_dwo_file (dwo_name, comp_dir);
9508 if (dwarf2_read_debug)
9509 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
9512 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
9513 dwo_file->dwo_name = dwo_name;
9514 dwo_file->comp_dir = comp_dir;
9515 dwo_file->dbfd = dbfd;
9517 cleanups = make_cleanup (free_dwo_file_cleanup, dwo_file);
9519 bfd_map_over_sections (dbfd, dwarf2_locate_dwo_sections, &dwo_file->sections);
9521 dwo_file->cu = create_dwo_cu (dwo_file);
9523 dwo_file->tus = create_debug_types_hash_table (dwo_file,
9524 dwo_file->sections.types);
9526 discard_cleanups (cleanups);
9528 if (dwarf2_read_debug)
9529 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
9534 /* This function is mapped across the sections and remembers the offset and
9535 size of each of the DWP debugging sections we are interested in. */
9538 dwarf2_locate_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
9540 struct dwp_file *dwp_file = dwp_file_ptr;
9541 const struct dwop_section_names *names = &dwop_section_names;
9542 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
9544 /* Record the ELF section number for later lookup: this is what the
9545 .debug_cu_index,.debug_tu_index tables use. */
9546 gdb_assert (elf_section_nr < dwp_file->num_sections);
9547 dwp_file->elf_sections[elf_section_nr] = sectp;
9549 /* Look for specific sections that we need. */
9550 if (section_is_p (sectp->name, &names->str_dwo))
9552 dwp_file->sections.str.asection = sectp;
9553 dwp_file->sections.str.size = bfd_get_section_size (sectp);
9555 else if (section_is_p (sectp->name, &names->cu_index))
9557 dwp_file->sections.cu_index.asection = sectp;
9558 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
9560 else if (section_is_p (sectp->name, &names->tu_index))
9562 dwp_file->sections.tu_index.asection = sectp;
9563 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
9567 /* Hash function for dwp_file loaded CUs/TUs. */
9570 hash_dwp_loaded_cutus (const void *item)
9572 const struct dwo_unit *dwo_unit = item;
9574 /* This drops the top 32 bits of the signature, but is ok for a hash. */
9575 return dwo_unit->signature;
9578 /* Equality function for dwp_file loaded CUs/TUs. */
9581 eq_dwp_loaded_cutus (const void *a, const void *b)
9583 const struct dwo_unit *dua = a;
9584 const struct dwo_unit *dub = b;
9586 return dua->signature == dub->signature;
9589 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
9592 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
9594 return htab_create_alloc_ex (3,
9595 hash_dwp_loaded_cutus,
9596 eq_dwp_loaded_cutus,
9598 &objfile->objfile_obstack,
9599 hashtab_obstack_allocate,
9600 dummy_obstack_deallocate);
9603 /* Try to open DWP file FILE_NAME.
9604 The result is the bfd handle of the file.
9605 If there is a problem finding or opening the file, return NULL.
9606 Upon success, the canonicalized path of the file is stored in the bfd,
9607 same as symfile_bfd_open. */
9610 open_dwp_file (const char *file_name)
9614 abfd = try_open_dwop_file (file_name, 1 /*is_dwp*/, 1 /*search_cwd*/);
9618 /* Work around upstream bug 15652.
9619 http://sourceware.org/bugzilla/show_bug.cgi?id=15652
9620 [Whether that's a "bug" is debatable, but it is getting in our way.]
9621 We have no real idea where the dwp file is, because gdb's realpath-ing
9622 of the executable's path may have discarded the needed info.
9623 [IWBN if the dwp file name was recorded in the executable, akin to
9624 .gnu_debuglink, but that doesn't exist yet.]
9625 Strip the directory from FILE_NAME and search again. */
9626 if (*debug_file_directory != '\0')
9628 /* Don't implicitly search the current directory here.
9629 If the user wants to search "." to handle this case,
9630 it must be added to debug-file-directory. */
9631 return try_open_dwop_file (lbasename (file_name), 1 /*is_dwp*/,
9638 /* Initialize the use of the DWP file for the current objfile.
9639 By convention the name of the DWP file is ${objfile}.dwp.
9640 The result is NULL if it can't be found. */
9642 static struct dwp_file *
9643 open_and_init_dwp_file (void)
9645 struct objfile *objfile = dwarf2_per_objfile->objfile;
9646 struct dwp_file *dwp_file;
9649 struct cleanup *cleanups;
9651 dwp_name = xstrprintf ("%s.dwp", objfile_name (dwarf2_per_objfile->objfile));
9652 cleanups = make_cleanup (xfree, dwp_name);
9654 dbfd = open_dwp_file (dwp_name);
9657 if (dwarf2_read_debug)
9658 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name);
9659 do_cleanups (cleanups);
9662 dwp_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_file);
9663 dwp_file->name = bfd_get_filename (dbfd);
9664 dwp_file->dbfd = dbfd;
9665 do_cleanups (cleanups);
9667 /* +1: section 0 is unused */
9668 dwp_file->num_sections = bfd_count_sections (dbfd) + 1;
9669 dwp_file->elf_sections =
9670 OBSTACK_CALLOC (&objfile->objfile_obstack,
9671 dwp_file->num_sections, asection *);
9673 bfd_map_over_sections (dbfd, dwarf2_locate_dwp_sections, dwp_file);
9675 dwp_file->cus = create_dwp_hash_table (dwp_file, 0);
9677 dwp_file->tus = create_dwp_hash_table (dwp_file, 1);
9679 dwp_file->loaded_cutus = allocate_dwp_loaded_cutus_table (objfile);
9681 if (dwarf2_read_debug)
9683 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
9684 fprintf_unfiltered (gdb_stdlog,
9685 " %s CUs, %s TUs\n",
9686 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
9687 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
9693 /* Wrapper around open_and_init_dwp_file, only open it once. */
9695 static struct dwp_file *
9698 if (! dwarf2_per_objfile->dwp_checked)
9700 dwarf2_per_objfile->dwp_file = open_and_init_dwp_file ();
9701 dwarf2_per_objfile->dwp_checked = 1;
9703 return dwarf2_per_objfile->dwp_file;
9706 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
9707 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
9708 or in the DWP file for the objfile, referenced by THIS_UNIT.
9709 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
9710 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
9712 This is called, for example, when wanting to read a variable with a
9713 complex location. Therefore we don't want to do file i/o for every call.
9714 Therefore we don't want to look for a DWO file on every call.
9715 Therefore we first see if we've already seen SIGNATURE in a DWP file,
9716 then we check if we've already seen DWO_NAME, and only THEN do we check
9719 The result is a pointer to the dwo_unit object or NULL if we didn't find it
9720 (dwo_id mismatch or couldn't find the DWO/DWP file). */
9722 static struct dwo_unit *
9723 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
9724 const char *dwo_name, const char *comp_dir,
9725 ULONGEST signature, int is_debug_types)
9727 struct objfile *objfile = dwarf2_per_objfile->objfile;
9728 const char *kind = is_debug_types ? "TU" : "CU";
9729 void **dwo_file_slot;
9730 struct dwo_file *dwo_file;
9731 struct dwp_file *dwp_file;
9733 /* First see if there's a DWP file.
9734 If we have a DWP file but didn't find the DWO inside it, don't
9735 look for the original DWO file. It makes gdb behave differently
9736 depending on whether one is debugging in the build tree. */
9738 dwp_file = get_dwp_file ();
9739 if (dwp_file != NULL)
9741 const struct dwp_hash_table *dwp_htab =
9742 is_debug_types ? dwp_file->tus : dwp_file->cus;
9744 if (dwp_htab != NULL)
9746 struct dwo_unit *dwo_cutu =
9747 lookup_dwo_in_dwp (dwp_file, dwp_htab, comp_dir,
9748 signature, is_debug_types);
9750 if (dwo_cutu != NULL)
9752 if (dwarf2_read_debug)
9754 fprintf_unfiltered (gdb_stdlog,
9755 "Virtual DWO %s %s found: @%s\n",
9756 kind, hex_string (signature),
9757 host_address_to_string (dwo_cutu));
9765 /* No DWP file, look for the DWO file. */
9767 dwo_file_slot = lookup_dwo_file_slot (dwo_name, comp_dir);
9768 if (*dwo_file_slot == NULL)
9770 /* Read in the file and build a table of the CUs/TUs it contains. */
9771 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
9773 /* NOTE: This will be NULL if unable to open the file. */
9774 dwo_file = *dwo_file_slot;
9776 if (dwo_file != NULL)
9778 struct dwo_unit *dwo_cutu = NULL;
9780 if (is_debug_types && dwo_file->tus)
9782 struct dwo_unit find_dwo_cutu;
9784 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
9785 find_dwo_cutu.signature = signature;
9786 dwo_cutu = htab_find (dwo_file->tus, &find_dwo_cutu);
9788 else if (!is_debug_types && dwo_file->cu)
9790 if (signature == dwo_file->cu->signature)
9791 dwo_cutu = dwo_file->cu;
9794 if (dwo_cutu != NULL)
9796 if (dwarf2_read_debug)
9798 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
9799 kind, dwo_name, hex_string (signature),
9800 host_address_to_string (dwo_cutu));
9807 /* We didn't find it. This could mean a dwo_id mismatch, or
9808 someone deleted the DWO/DWP file, or the search path isn't set up
9809 correctly to find the file. */
9811 if (dwarf2_read_debug)
9813 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
9814 kind, dwo_name, hex_string (signature));
9817 /* This is a warning and not a complaint because it can be caused by
9818 pilot error (e.g., user accidentally deleting the DWO). */
9819 warning (_("Could not find DWO %s %s(%s) referenced by %s at offset 0x%x"
9821 kind, dwo_name, hex_string (signature),
9822 this_unit->is_debug_types ? "TU" : "CU",
9823 this_unit->offset.sect_off, objfile_name (objfile));
9827 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
9828 See lookup_dwo_cutu_unit for details. */
9830 static struct dwo_unit *
9831 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
9832 const char *dwo_name, const char *comp_dir,
9835 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
9838 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
9839 See lookup_dwo_cutu_unit for details. */
9841 static struct dwo_unit *
9842 lookup_dwo_type_unit (struct signatured_type *this_tu,
9843 const char *dwo_name, const char *comp_dir)
9845 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
9848 /* Traversal function for queue_and_load_all_dwo_tus. */
9851 queue_and_load_dwo_tu (void **slot, void *info)
9853 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
9854 struct dwarf2_per_cu_data *per_cu = (struct dwarf2_per_cu_data *) info;
9855 ULONGEST signature = dwo_unit->signature;
9856 struct signatured_type *sig_type =
9857 lookup_dwo_signatured_type (per_cu->cu, signature);
9859 if (sig_type != NULL)
9861 struct dwarf2_per_cu_data *sig_cu = &sig_type->per_cu;
9863 /* We pass NULL for DEPENDENT_CU because we don't yet know if there's
9864 a real dependency of PER_CU on SIG_TYPE. That is detected later
9865 while processing PER_CU. */
9866 if (maybe_queue_comp_unit (NULL, sig_cu, per_cu->cu->language))
9867 load_full_type_unit (sig_cu);
9868 VEC_safe_push (dwarf2_per_cu_ptr, per_cu->imported_symtabs, sig_cu);
9874 /* Queue all TUs contained in the DWO of PER_CU to be read in.
9875 The DWO may have the only definition of the type, though it may not be
9876 referenced anywhere in PER_CU. Thus we have to load *all* its TUs.
9877 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
9880 queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *per_cu)
9882 struct dwo_unit *dwo_unit;
9883 struct dwo_file *dwo_file;
9885 gdb_assert (!per_cu->is_debug_types);
9886 gdb_assert (get_dwp_file () == NULL);
9887 gdb_assert (per_cu->cu != NULL);
9889 dwo_unit = per_cu->cu->dwo_unit;
9890 gdb_assert (dwo_unit != NULL);
9892 dwo_file = dwo_unit->dwo_file;
9893 if (dwo_file->tus != NULL)
9894 htab_traverse_noresize (dwo_file->tus, queue_and_load_dwo_tu, per_cu);
9897 /* Free all resources associated with DWO_FILE.
9898 Close the DWO file and munmap the sections.
9899 All memory should be on the objfile obstack. */
9902 free_dwo_file (struct dwo_file *dwo_file, struct objfile *objfile)
9905 struct dwarf2_section_info *section;
9907 /* Note: dbfd is NULL for virtual DWO files. */
9908 gdb_bfd_unref (dwo_file->dbfd);
9910 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
9913 /* Wrapper for free_dwo_file for use in cleanups. */
9916 free_dwo_file_cleanup (void *arg)
9918 struct dwo_file *dwo_file = (struct dwo_file *) arg;
9919 struct objfile *objfile = dwarf2_per_objfile->objfile;
9921 free_dwo_file (dwo_file, objfile);
9924 /* Traversal function for free_dwo_files. */
9927 free_dwo_file_from_slot (void **slot, void *info)
9929 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
9930 struct objfile *objfile = (struct objfile *) info;
9932 free_dwo_file (dwo_file, objfile);
9937 /* Free all resources associated with DWO_FILES. */
9940 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
9942 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
9945 /* Read in various DIEs. */
9947 /* qsort helper for inherit_abstract_dies. */
9950 unsigned_int_compar (const void *ap, const void *bp)
9952 unsigned int a = *(unsigned int *) ap;
9953 unsigned int b = *(unsigned int *) bp;
9955 return (a > b) - (b > a);
9958 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
9959 Inherit only the children of the DW_AT_abstract_origin DIE not being
9960 already referenced by DW_AT_abstract_origin from the children of the
9964 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
9966 struct die_info *child_die;
9967 unsigned die_children_count;
9968 /* CU offsets which were referenced by children of the current DIE. */
9969 sect_offset *offsets;
9970 sect_offset *offsets_end, *offsetp;
9971 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
9972 struct die_info *origin_die;
9973 /* Iterator of the ORIGIN_DIE children. */
9974 struct die_info *origin_child_die;
9975 struct cleanup *cleanups;
9976 struct attribute *attr;
9977 struct dwarf2_cu *origin_cu;
9978 struct pending **origin_previous_list_in_scope;
9980 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
9984 /* Note that following die references may follow to a die in a
9988 origin_die = follow_die_ref (die, attr, &origin_cu);
9990 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
9992 origin_previous_list_in_scope = origin_cu->list_in_scope;
9993 origin_cu->list_in_scope = cu->list_in_scope;
9995 if (die->tag != origin_die->tag
9996 && !(die->tag == DW_TAG_inlined_subroutine
9997 && origin_die->tag == DW_TAG_subprogram))
9998 complaint (&symfile_complaints,
9999 _("DIE 0x%x and its abstract origin 0x%x have different tags"),
10000 die->offset.sect_off, origin_die->offset.sect_off);
10002 child_die = die->child;
10003 die_children_count = 0;
10004 while (child_die && child_die->tag)
10006 child_die = sibling_die (child_die);
10007 die_children_count++;
10009 offsets = xmalloc (sizeof (*offsets) * die_children_count);
10010 cleanups = make_cleanup (xfree, offsets);
10012 offsets_end = offsets;
10013 child_die = die->child;
10014 while (child_die && child_die->tag)
10016 /* For each CHILD_DIE, find the corresponding child of
10017 ORIGIN_DIE. If there is more than one layer of
10018 DW_AT_abstract_origin, follow them all; there shouldn't be,
10019 but GCC versions at least through 4.4 generate this (GCC PR
10021 struct die_info *child_origin_die = child_die;
10022 struct dwarf2_cu *child_origin_cu = cu;
10026 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
10030 child_origin_die = follow_die_ref (child_origin_die, attr,
10034 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
10035 counterpart may exist. */
10036 if (child_origin_die != child_die)
10038 if (child_die->tag != child_origin_die->tag
10039 && !(child_die->tag == DW_TAG_inlined_subroutine
10040 && child_origin_die->tag == DW_TAG_subprogram))
10041 complaint (&symfile_complaints,
10042 _("Child DIE 0x%x and its abstract origin 0x%x have "
10043 "different tags"), child_die->offset.sect_off,
10044 child_origin_die->offset.sect_off);
10045 if (child_origin_die->parent != origin_die)
10046 complaint (&symfile_complaints,
10047 _("Child DIE 0x%x and its abstract origin 0x%x have "
10048 "different parents"), child_die->offset.sect_off,
10049 child_origin_die->offset.sect_off);
10051 *offsets_end++ = child_origin_die->offset;
10053 child_die = sibling_die (child_die);
10055 qsort (offsets, offsets_end - offsets, sizeof (*offsets),
10056 unsigned_int_compar);
10057 for (offsetp = offsets + 1; offsetp < offsets_end; offsetp++)
10058 if (offsetp[-1].sect_off == offsetp->sect_off)
10059 complaint (&symfile_complaints,
10060 _("Multiple children of DIE 0x%x refer "
10061 "to DIE 0x%x as their abstract origin"),
10062 die->offset.sect_off, offsetp->sect_off);
10065 origin_child_die = origin_die->child;
10066 while (origin_child_die && origin_child_die->tag)
10068 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
10069 while (offsetp < offsets_end
10070 && offsetp->sect_off < origin_child_die->offset.sect_off)
10072 if (offsetp >= offsets_end
10073 || offsetp->sect_off > origin_child_die->offset.sect_off)
10075 /* Found that ORIGIN_CHILD_DIE is really not referenced. */
10076 process_die (origin_child_die, origin_cu);
10078 origin_child_die = sibling_die (origin_child_die);
10080 origin_cu->list_in_scope = origin_previous_list_in_scope;
10082 do_cleanups (cleanups);
10086 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
10088 struct objfile *objfile = cu->objfile;
10089 struct context_stack *new;
10092 struct die_info *child_die;
10093 struct attribute *attr, *call_line, *call_file;
10095 CORE_ADDR baseaddr;
10096 struct block *block;
10097 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
10098 VEC (symbolp) *template_args = NULL;
10099 struct template_symbol *templ_func = NULL;
10103 /* If we do not have call site information, we can't show the
10104 caller of this inlined function. That's too confusing, so
10105 only use the scope for local variables. */
10106 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
10107 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
10108 if (call_line == NULL || call_file == NULL)
10110 read_lexical_block_scope (die, cu);
10115 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10117 name = dwarf2_name (die, cu);
10119 /* Ignore functions with missing or empty names. These are actually
10120 illegal according to the DWARF standard. */
10123 complaint (&symfile_complaints,
10124 _("missing name for subprogram DIE at %d"),
10125 die->offset.sect_off);
10129 /* Ignore functions with missing or invalid low and high pc attributes. */
10130 if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
10132 attr = dwarf2_attr (die, DW_AT_external, cu);
10133 if (!attr || !DW_UNSND (attr))
10134 complaint (&symfile_complaints,
10135 _("cannot get low and high bounds "
10136 "for subprogram DIE at %d"),
10137 die->offset.sect_off);
10142 highpc += baseaddr;
10144 /* If we have any template arguments, then we must allocate a
10145 different sort of symbol. */
10146 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
10148 if (child_die->tag == DW_TAG_template_type_param
10149 || child_die->tag == DW_TAG_template_value_param)
10151 templ_func = allocate_template_symbol (objfile);
10152 templ_func->base.is_cplus_template_function = 1;
10157 new = push_context (0, lowpc);
10158 new->name = new_symbol_full (die, read_type_die (die, cu), cu,
10159 (struct symbol *) templ_func);
10161 /* If there is a location expression for DW_AT_frame_base, record
10163 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
10165 dwarf2_symbol_mark_computed (attr, new->name, cu, 1);
10167 cu->list_in_scope = &local_symbols;
10169 if (die->child != NULL)
10171 child_die = die->child;
10172 while (child_die && child_die->tag)
10174 if (child_die->tag == DW_TAG_template_type_param
10175 || child_die->tag == DW_TAG_template_value_param)
10177 struct symbol *arg = new_symbol (child_die, NULL, cu);
10180 VEC_safe_push (symbolp, template_args, arg);
10183 process_die (child_die, cu);
10184 child_die = sibling_die (child_die);
10188 inherit_abstract_dies (die, cu);
10190 /* If we have a DW_AT_specification, we might need to import using
10191 directives from the context of the specification DIE. See the
10192 comment in determine_prefix. */
10193 if (cu->language == language_cplus
10194 && dwarf2_attr (die, DW_AT_specification, cu))
10196 struct dwarf2_cu *spec_cu = cu;
10197 struct die_info *spec_die = die_specification (die, &spec_cu);
10201 child_die = spec_die->child;
10202 while (child_die && child_die->tag)
10204 if (child_die->tag == DW_TAG_imported_module)
10205 process_die (child_die, spec_cu);
10206 child_die = sibling_die (child_die);
10209 /* In some cases, GCC generates specification DIEs that
10210 themselves contain DW_AT_specification attributes. */
10211 spec_die = die_specification (spec_die, &spec_cu);
10215 new = pop_context ();
10216 /* Make a block for the local symbols within. */
10217 block = finish_block (new->name, &local_symbols, new->old_blocks,
10218 lowpc, highpc, objfile);
10220 /* For C++, set the block's scope. */
10221 if ((cu->language == language_cplus || cu->language == language_fortran)
10222 && cu->processing_has_namespace_info)
10223 block_set_scope (block, determine_prefix (die, cu),
10224 &objfile->objfile_obstack);
10226 /* If we have address ranges, record them. */
10227 dwarf2_record_block_ranges (die, block, baseaddr, cu);
10229 /* Attach template arguments to function. */
10230 if (! VEC_empty (symbolp, template_args))
10232 gdb_assert (templ_func != NULL);
10234 templ_func->n_template_arguments = VEC_length (symbolp, template_args);
10235 templ_func->template_arguments
10236 = obstack_alloc (&objfile->objfile_obstack,
10237 (templ_func->n_template_arguments
10238 * sizeof (struct symbol *)));
10239 memcpy (templ_func->template_arguments,
10240 VEC_address (symbolp, template_args),
10241 (templ_func->n_template_arguments * sizeof (struct symbol *)));
10242 VEC_free (symbolp, template_args);
10245 /* In C++, we can have functions nested inside functions (e.g., when
10246 a function declares a class that has methods). This means that
10247 when we finish processing a function scope, we may need to go
10248 back to building a containing block's symbol lists. */
10249 local_symbols = new->locals;
10250 using_directives = new->using_directives;
10252 /* If we've finished processing a top-level function, subsequent
10253 symbols go in the file symbol list. */
10254 if (outermost_context_p ())
10255 cu->list_in_scope = &file_symbols;
10258 /* Process all the DIES contained within a lexical block scope. Start
10259 a new scope, process the dies, and then close the scope. */
10262 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
10264 struct objfile *objfile = cu->objfile;
10265 struct context_stack *new;
10266 CORE_ADDR lowpc, highpc;
10267 struct die_info *child_die;
10268 CORE_ADDR baseaddr;
10270 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10272 /* Ignore blocks with missing or invalid low and high pc attributes. */
10273 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
10274 as multiple lexical blocks? Handling children in a sane way would
10275 be nasty. Might be easier to properly extend generic blocks to
10276 describe ranges. */
10277 if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
10280 highpc += baseaddr;
10282 push_context (0, lowpc);
10283 if (die->child != NULL)
10285 child_die = die->child;
10286 while (child_die && child_die->tag)
10288 process_die (child_die, cu);
10289 child_die = sibling_die (child_die);
10292 new = pop_context ();
10294 if (local_symbols != NULL || using_directives != NULL)
10296 struct block *block
10297 = finish_block (0, &local_symbols, new->old_blocks, new->start_addr,
10300 /* Note that recording ranges after traversing children, as we
10301 do here, means that recording a parent's ranges entails
10302 walking across all its children's ranges as they appear in
10303 the address map, which is quadratic behavior.
10305 It would be nicer to record the parent's ranges before
10306 traversing its children, simply overriding whatever you find
10307 there. But since we don't even decide whether to create a
10308 block until after we've traversed its children, that's hard
10310 dwarf2_record_block_ranges (die, block, baseaddr, cu);
10312 local_symbols = new->locals;
10313 using_directives = new->using_directives;
10316 /* Read in DW_TAG_GNU_call_site and insert it to CU->call_site_htab. */
10319 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
10321 struct objfile *objfile = cu->objfile;
10322 struct gdbarch *gdbarch = get_objfile_arch (objfile);
10323 CORE_ADDR pc, baseaddr;
10324 struct attribute *attr;
10325 struct call_site *call_site, call_site_local;
10328 struct die_info *child_die;
10330 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10332 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
10335 complaint (&symfile_complaints,
10336 _("missing DW_AT_low_pc for DW_TAG_GNU_call_site "
10337 "DIE 0x%x [in module %s]"),
10338 die->offset.sect_off, objfile_name (objfile));
10341 pc = DW_ADDR (attr) + baseaddr;
10343 if (cu->call_site_htab == NULL)
10344 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
10345 NULL, &objfile->objfile_obstack,
10346 hashtab_obstack_allocate, NULL);
10347 call_site_local.pc = pc;
10348 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
10351 complaint (&symfile_complaints,
10352 _("Duplicate PC %s for DW_TAG_GNU_call_site "
10353 "DIE 0x%x [in module %s]"),
10354 paddress (gdbarch, pc), die->offset.sect_off,
10355 objfile_name (objfile));
10359 /* Count parameters at the caller. */
10362 for (child_die = die->child; child_die && child_die->tag;
10363 child_die = sibling_die (child_die))
10365 if (child_die->tag != DW_TAG_GNU_call_site_parameter)
10367 complaint (&symfile_complaints,
10368 _("Tag %d is not DW_TAG_GNU_call_site_parameter in "
10369 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
10370 child_die->tag, child_die->offset.sect_off,
10371 objfile_name (objfile));
10378 call_site = obstack_alloc (&objfile->objfile_obstack,
10379 (sizeof (*call_site)
10380 + (sizeof (*call_site->parameter)
10381 * (nparams - 1))));
10383 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
10384 call_site->pc = pc;
10386 if (dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
10388 struct die_info *func_die;
10390 /* Skip also over DW_TAG_inlined_subroutine. */
10391 for (func_die = die->parent;
10392 func_die && func_die->tag != DW_TAG_subprogram
10393 && func_die->tag != DW_TAG_subroutine_type;
10394 func_die = func_die->parent);
10396 /* DW_AT_GNU_all_call_sites is a superset
10397 of DW_AT_GNU_all_tail_call_sites. */
10399 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
10400 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
10402 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
10403 not complete. But keep CALL_SITE for look ups via call_site_htab,
10404 both the initial caller containing the real return address PC and
10405 the final callee containing the current PC of a chain of tail
10406 calls do not need to have the tail call list complete. But any
10407 function candidate for a virtual tail call frame searched via
10408 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
10409 determined unambiguously. */
10413 struct type *func_type = NULL;
10416 func_type = get_die_type (func_die, cu);
10417 if (func_type != NULL)
10419 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
10421 /* Enlist this call site to the function. */
10422 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
10423 TYPE_TAIL_CALL_LIST (func_type) = call_site;
10426 complaint (&symfile_complaints,
10427 _("Cannot find function owning DW_TAG_GNU_call_site "
10428 "DIE 0x%x [in module %s]"),
10429 die->offset.sect_off, objfile_name (objfile));
10433 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
10435 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
10436 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
10437 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
10438 /* Keep NULL DWARF_BLOCK. */;
10439 else if (attr_form_is_block (attr))
10441 struct dwarf2_locexpr_baton *dlbaton;
10443 dlbaton = obstack_alloc (&objfile->objfile_obstack, sizeof (*dlbaton));
10444 dlbaton->data = DW_BLOCK (attr)->data;
10445 dlbaton->size = DW_BLOCK (attr)->size;
10446 dlbaton->per_cu = cu->per_cu;
10448 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
10450 else if (attr_form_is_ref (attr))
10452 struct dwarf2_cu *target_cu = cu;
10453 struct die_info *target_die;
10455 target_die = follow_die_ref (die, attr, &target_cu);
10456 gdb_assert (target_cu->objfile == objfile);
10457 if (die_is_declaration (target_die, target_cu))
10459 const char *target_physname = NULL;
10460 struct attribute *target_attr;
10462 /* Prefer the mangled name; otherwise compute the demangled one. */
10463 target_attr = dwarf2_attr (target_die, DW_AT_linkage_name, target_cu);
10464 if (target_attr == NULL)
10465 target_attr = dwarf2_attr (target_die, DW_AT_MIPS_linkage_name,
10467 if (target_attr != NULL && DW_STRING (target_attr) != NULL)
10468 target_physname = DW_STRING (target_attr);
10470 target_physname = dwarf2_physname (NULL, target_die, target_cu);
10471 if (target_physname == NULL)
10472 complaint (&symfile_complaints,
10473 _("DW_AT_GNU_call_site_target target DIE has invalid "
10474 "physname, for referencing DIE 0x%x [in module %s]"),
10475 die->offset.sect_off, objfile_name (objfile));
10477 SET_FIELD_PHYSNAME (call_site->target, target_physname);
10483 /* DW_AT_entry_pc should be preferred. */
10484 if (!dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL))
10485 complaint (&symfile_complaints,
10486 _("DW_AT_GNU_call_site_target target DIE has invalid "
10487 "low pc, for referencing DIE 0x%x [in module %s]"),
10488 die->offset.sect_off, objfile_name (objfile));
10490 SET_FIELD_PHYSADDR (call_site->target, lowpc + baseaddr);
10494 complaint (&symfile_complaints,
10495 _("DW_TAG_GNU_call_site DW_AT_GNU_call_site_target is neither "
10496 "block nor reference, for DIE 0x%x [in module %s]"),
10497 die->offset.sect_off, objfile_name (objfile));
10499 call_site->per_cu = cu->per_cu;
10501 for (child_die = die->child;
10502 child_die && child_die->tag;
10503 child_die = sibling_die (child_die))
10505 struct call_site_parameter *parameter;
10506 struct attribute *loc, *origin;
10508 if (child_die->tag != DW_TAG_GNU_call_site_parameter)
10510 /* Already printed the complaint above. */
10514 gdb_assert (call_site->parameter_count < nparams);
10515 parameter = &call_site->parameter[call_site->parameter_count];
10517 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
10518 specifies DW_TAG_formal_parameter. Value of the data assumed for the
10519 register is contained in DW_AT_GNU_call_site_value. */
10521 loc = dwarf2_attr (child_die, DW_AT_location, cu);
10522 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
10523 if (loc == NULL && origin != NULL && attr_form_is_ref (origin))
10525 sect_offset offset;
10527 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
10528 offset = dwarf2_get_ref_die_offset (origin);
10529 if (!offset_in_cu_p (&cu->header, offset))
10531 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
10532 binding can be done only inside one CU. Such referenced DIE
10533 therefore cannot be even moved to DW_TAG_partial_unit. */
10534 complaint (&symfile_complaints,
10535 _("DW_AT_abstract_origin offset is not in CU for "
10536 "DW_TAG_GNU_call_site child DIE 0x%x "
10538 child_die->offset.sect_off, objfile_name (objfile));
10541 parameter->u.param_offset.cu_off = (offset.sect_off
10542 - cu->header.offset.sect_off);
10544 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
10546 complaint (&symfile_complaints,
10547 _("No DW_FORM_block* DW_AT_location for "
10548 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
10549 child_die->offset.sect_off, objfile_name (objfile));
10554 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
10555 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
10556 if (parameter->u.dwarf_reg != -1)
10557 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
10558 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
10559 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
10560 ¶meter->u.fb_offset))
10561 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
10564 complaint (&symfile_complaints,
10565 _("Only single DW_OP_reg or DW_OP_fbreg is supported "
10566 "for DW_FORM_block* DW_AT_location is supported for "
10567 "DW_TAG_GNU_call_site child DIE 0x%x "
10569 child_die->offset.sect_off, objfile_name (objfile));
10574 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
10575 if (!attr_form_is_block (attr))
10577 complaint (&symfile_complaints,
10578 _("No DW_FORM_block* DW_AT_GNU_call_site_value for "
10579 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
10580 child_die->offset.sect_off, objfile_name (objfile));
10583 parameter->value = DW_BLOCK (attr)->data;
10584 parameter->value_size = DW_BLOCK (attr)->size;
10586 /* Parameters are not pre-cleared by memset above. */
10587 parameter->data_value = NULL;
10588 parameter->data_value_size = 0;
10589 call_site->parameter_count++;
10591 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
10594 if (!attr_form_is_block (attr))
10595 complaint (&symfile_complaints,
10596 _("No DW_FORM_block* DW_AT_GNU_call_site_data_value for "
10597 "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"),
10598 child_die->offset.sect_off, objfile_name (objfile));
10601 parameter->data_value = DW_BLOCK (attr)->data;
10602 parameter->data_value_size = DW_BLOCK (attr)->size;
10608 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
10609 Return 1 if the attributes are present and valid, otherwise, return 0.
10610 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
10613 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
10614 CORE_ADDR *high_return, struct dwarf2_cu *cu,
10615 struct partial_symtab *ranges_pst)
10617 struct objfile *objfile = cu->objfile;
10618 struct comp_unit_head *cu_header = &cu->header;
10619 bfd *obfd = objfile->obfd;
10620 unsigned int addr_size = cu_header->addr_size;
10621 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
10622 /* Base address selection entry. */
10625 unsigned int dummy;
10626 const gdb_byte *buffer;
10630 CORE_ADDR high = 0;
10631 CORE_ADDR baseaddr;
10633 found_base = cu->base_known;
10634 base = cu->base_address;
10636 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
10637 if (offset >= dwarf2_per_objfile->ranges.size)
10639 complaint (&symfile_complaints,
10640 _("Offset %d out of bounds for DW_AT_ranges attribute"),
10644 buffer = dwarf2_per_objfile->ranges.buffer + offset;
10646 /* Read in the largest possible address. */
10647 marker = read_address (obfd, buffer, cu, &dummy);
10648 if ((marker & mask) == mask)
10650 /* If we found the largest possible address, then
10651 read the base address. */
10652 base = read_address (obfd, buffer + addr_size, cu, &dummy);
10653 buffer += 2 * addr_size;
10654 offset += 2 * addr_size;
10660 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10664 CORE_ADDR range_beginning, range_end;
10666 range_beginning = read_address (obfd, buffer, cu, &dummy);
10667 buffer += addr_size;
10668 range_end = read_address (obfd, buffer, cu, &dummy);
10669 buffer += addr_size;
10670 offset += 2 * addr_size;
10672 /* An end of list marker is a pair of zero addresses. */
10673 if (range_beginning == 0 && range_end == 0)
10674 /* Found the end of list entry. */
10677 /* Each base address selection entry is a pair of 2 values.
10678 The first is the largest possible address, the second is
10679 the base address. Check for a base address here. */
10680 if ((range_beginning & mask) == mask)
10682 /* If we found the largest possible address, then
10683 read the base address. */
10684 base = read_address (obfd, buffer + addr_size, cu, &dummy);
10691 /* We have no valid base address for the ranges
10693 complaint (&symfile_complaints,
10694 _("Invalid .debug_ranges data (no base address)"));
10698 if (range_beginning > range_end)
10700 /* Inverted range entries are invalid. */
10701 complaint (&symfile_complaints,
10702 _("Invalid .debug_ranges data (inverted range)"));
10706 /* Empty range entries have no effect. */
10707 if (range_beginning == range_end)
10710 range_beginning += base;
10713 /* A not-uncommon case of bad debug info.
10714 Don't pollute the addrmap with bad data. */
10715 if (range_beginning + baseaddr == 0
10716 && !dwarf2_per_objfile->has_section_at_zero)
10718 complaint (&symfile_complaints,
10719 _(".debug_ranges entry has start address of zero"
10720 " [in module %s]"), objfile_name (objfile));
10724 if (ranges_pst != NULL)
10725 addrmap_set_empty (objfile->psymtabs_addrmap,
10726 range_beginning + baseaddr,
10727 range_end - 1 + baseaddr,
10730 /* FIXME: This is recording everything as a low-high
10731 segment of consecutive addresses. We should have a
10732 data structure for discontiguous block ranges
10736 low = range_beginning;
10742 if (range_beginning < low)
10743 low = range_beginning;
10744 if (range_end > high)
10750 /* If the first entry is an end-of-list marker, the range
10751 describes an empty scope, i.e. no instructions. */
10757 *high_return = high;
10761 /* Get low and high pc attributes from a die. Return 1 if the attributes
10762 are present and valid, otherwise, return 0. Return -1 if the range is
10763 discontinuous, i.e. derived from DW_AT_ranges information. */
10766 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
10767 CORE_ADDR *highpc, struct dwarf2_cu *cu,
10768 struct partial_symtab *pst)
10770 struct attribute *attr;
10771 struct attribute *attr_high;
10773 CORE_ADDR high = 0;
10776 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
10779 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
10782 low = DW_ADDR (attr);
10783 if (attr_high->form == DW_FORM_addr
10784 || attr_high->form == DW_FORM_GNU_addr_index)
10785 high = DW_ADDR (attr_high);
10787 high = low + DW_UNSND (attr_high);
10790 /* Found high w/o low attribute. */
10793 /* Found consecutive range of addresses. */
10798 attr = dwarf2_attr (die, DW_AT_ranges, cu);
10801 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
10802 We take advantage of the fact that DW_AT_ranges does not appear
10803 in DW_TAG_compile_unit of DWO files. */
10804 int need_ranges_base = die->tag != DW_TAG_compile_unit;
10805 unsigned int ranges_offset = (DW_UNSND (attr)
10806 + (need_ranges_base
10810 /* Value of the DW_AT_ranges attribute is the offset in the
10811 .debug_ranges section. */
10812 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
10814 /* Found discontinuous range of addresses. */
10819 /* read_partial_die has also the strict LOW < HIGH requirement. */
10823 /* When using the GNU linker, .gnu.linkonce. sections are used to
10824 eliminate duplicate copies of functions and vtables and such.
10825 The linker will arbitrarily choose one and discard the others.
10826 The AT_*_pc values for such functions refer to local labels in
10827 these sections. If the section from that file was discarded, the
10828 labels are not in the output, so the relocs get a value of 0.
10829 If this is a discarded function, mark the pc bounds as invalid,
10830 so that GDB will ignore it. */
10831 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
10840 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
10841 its low and high PC addresses. Do nothing if these addresses could not
10842 be determined. Otherwise, set LOWPC to the low address if it is smaller,
10843 and HIGHPC to the high address if greater than HIGHPC. */
10846 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
10847 CORE_ADDR *lowpc, CORE_ADDR *highpc,
10848 struct dwarf2_cu *cu)
10850 CORE_ADDR low, high;
10851 struct die_info *child = die->child;
10853 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL))
10855 *lowpc = min (*lowpc, low);
10856 *highpc = max (*highpc, high);
10859 /* If the language does not allow nested subprograms (either inside
10860 subprograms or lexical blocks), we're done. */
10861 if (cu->language != language_ada)
10864 /* Check all the children of the given DIE. If it contains nested
10865 subprograms, then check their pc bounds. Likewise, we need to
10866 check lexical blocks as well, as they may also contain subprogram
10868 while (child && child->tag)
10870 if (child->tag == DW_TAG_subprogram
10871 || child->tag == DW_TAG_lexical_block)
10872 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
10873 child = sibling_die (child);
10877 /* Get the low and high pc's represented by the scope DIE, and store
10878 them in *LOWPC and *HIGHPC. If the correct values can't be
10879 determined, set *LOWPC to -1 and *HIGHPC to 0. */
10882 get_scope_pc_bounds (struct die_info *die,
10883 CORE_ADDR *lowpc, CORE_ADDR *highpc,
10884 struct dwarf2_cu *cu)
10886 CORE_ADDR best_low = (CORE_ADDR) -1;
10887 CORE_ADDR best_high = (CORE_ADDR) 0;
10888 CORE_ADDR current_low, current_high;
10890 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL))
10892 best_low = current_low;
10893 best_high = current_high;
10897 struct die_info *child = die->child;
10899 while (child && child->tag)
10901 switch (child->tag) {
10902 case DW_TAG_subprogram:
10903 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
10905 case DW_TAG_namespace:
10906 case DW_TAG_module:
10907 /* FIXME: carlton/2004-01-16: Should we do this for
10908 DW_TAG_class_type/DW_TAG_structure_type, too? I think
10909 that current GCC's always emit the DIEs corresponding
10910 to definitions of methods of classes as children of a
10911 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
10912 the DIEs giving the declarations, which could be
10913 anywhere). But I don't see any reason why the
10914 standards says that they have to be there. */
10915 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
10917 if (current_low != ((CORE_ADDR) -1))
10919 best_low = min (best_low, current_low);
10920 best_high = max (best_high, current_high);
10928 child = sibling_die (child);
10933 *highpc = best_high;
10936 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
10940 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
10941 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
10943 struct objfile *objfile = cu->objfile;
10944 struct attribute *attr;
10945 struct attribute *attr_high;
10947 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
10950 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
10953 CORE_ADDR low = DW_ADDR (attr);
10955 if (attr_high->form == DW_FORM_addr
10956 || attr_high->form == DW_FORM_GNU_addr_index)
10957 high = DW_ADDR (attr_high);
10959 high = low + DW_UNSND (attr_high);
10961 record_block_range (block, baseaddr + low, baseaddr + high - 1);
10965 attr = dwarf2_attr (die, DW_AT_ranges, cu);
10968 bfd *obfd = objfile->obfd;
10969 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
10970 We take advantage of the fact that DW_AT_ranges does not appear
10971 in DW_TAG_compile_unit of DWO files. */
10972 int need_ranges_base = die->tag != DW_TAG_compile_unit;
10974 /* The value of the DW_AT_ranges attribute is the offset of the
10975 address range list in the .debug_ranges section. */
10976 unsigned long offset = (DW_UNSND (attr)
10977 + (need_ranges_base ? cu->ranges_base : 0));
10978 const gdb_byte *buffer;
10980 /* For some target architectures, but not others, the
10981 read_address function sign-extends the addresses it returns.
10982 To recognize base address selection entries, we need a
10984 unsigned int addr_size = cu->header.addr_size;
10985 CORE_ADDR base_select_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
10987 /* The base address, to which the next pair is relative. Note
10988 that this 'base' is a DWARF concept: most entries in a range
10989 list are relative, to reduce the number of relocs against the
10990 debugging information. This is separate from this function's
10991 'baseaddr' argument, which GDB uses to relocate debugging
10992 information from a shared library based on the address at
10993 which the library was loaded. */
10994 CORE_ADDR base = cu->base_address;
10995 int base_known = cu->base_known;
10997 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
10998 if (offset >= dwarf2_per_objfile->ranges.size)
11000 complaint (&symfile_complaints,
11001 _("Offset %lu out of bounds for DW_AT_ranges attribute"),
11005 buffer = dwarf2_per_objfile->ranges.buffer + offset;
11009 unsigned int bytes_read;
11010 CORE_ADDR start, end;
11012 start = read_address (obfd, buffer, cu, &bytes_read);
11013 buffer += bytes_read;
11014 end = read_address (obfd, buffer, cu, &bytes_read);
11015 buffer += bytes_read;
11017 /* Did we find the end of the range list? */
11018 if (start == 0 && end == 0)
11021 /* Did we find a base address selection entry? */
11022 else if ((start & base_select_mask) == base_select_mask)
11028 /* We found an ordinary address range. */
11033 complaint (&symfile_complaints,
11034 _("Invalid .debug_ranges data "
11035 "(no base address)"));
11041 /* Inverted range entries are invalid. */
11042 complaint (&symfile_complaints,
11043 _("Invalid .debug_ranges data "
11044 "(inverted range)"));
11048 /* Empty range entries have no effect. */
11052 start += base + baseaddr;
11053 end += base + baseaddr;
11055 /* A not-uncommon case of bad debug info.
11056 Don't pollute the addrmap with bad data. */
11057 if (start == 0 && !dwarf2_per_objfile->has_section_at_zero)
11059 complaint (&symfile_complaints,
11060 _(".debug_ranges entry has start address of zero"
11061 " [in module %s]"), objfile_name (objfile));
11065 record_block_range (block, start, end - 1);
11071 /* Check whether the producer field indicates either of GCC < 4.6, or the
11072 Intel C/C++ compiler, and cache the result in CU. */
11075 check_producer (struct dwarf2_cu *cu)
11078 int major, minor, release;
11080 if (cu->producer == NULL)
11082 /* For unknown compilers expect their behavior is DWARF version
11085 GCC started to support .debug_types sections by -gdwarf-4 since
11086 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
11087 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
11088 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
11089 interpreted incorrectly by GDB now - GCC PR debug/48229. */
11091 else if (strncmp (cu->producer, "GNU ", strlen ("GNU ")) == 0)
11093 /* Skip any identifier after "GNU " - such as "C++" or "Java". */
11095 cs = &cu->producer[strlen ("GNU ")];
11096 while (*cs && !isdigit (*cs))
11098 if (sscanf (cs, "%d.%d.%d", &major, &minor, &release) != 3)
11100 /* Not recognized as GCC. */
11104 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
11105 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
11108 else if (strncmp (cu->producer, "Intel(R) C", strlen ("Intel(R) C")) == 0)
11109 cu->producer_is_icc = 1;
11112 /* For other non-GCC compilers, expect their behavior is DWARF version
11116 cu->checked_producer = 1;
11119 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
11120 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
11121 during 4.6.0 experimental. */
11124 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
11126 if (!cu->checked_producer)
11127 check_producer (cu);
11129 return cu->producer_is_gxx_lt_4_6;
11132 /* Return the default accessibility type if it is not overriden by
11133 DW_AT_accessibility. */
11135 static enum dwarf_access_attribute
11136 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
11138 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
11140 /* The default DWARF 2 accessibility for members is public, the default
11141 accessibility for inheritance is private. */
11143 if (die->tag != DW_TAG_inheritance)
11144 return DW_ACCESS_public;
11146 return DW_ACCESS_private;
11150 /* DWARF 3+ defines the default accessibility a different way. The same
11151 rules apply now for DW_TAG_inheritance as for the members and it only
11152 depends on the container kind. */
11154 if (die->parent->tag == DW_TAG_class_type)
11155 return DW_ACCESS_private;
11157 return DW_ACCESS_public;
11161 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
11162 offset. If the attribute was not found return 0, otherwise return
11163 1. If it was found but could not properly be handled, set *OFFSET
11167 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
11170 struct attribute *attr;
11172 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
11177 /* Note that we do not check for a section offset first here.
11178 This is because DW_AT_data_member_location is new in DWARF 4,
11179 so if we see it, we can assume that a constant form is really
11180 a constant and not a section offset. */
11181 if (attr_form_is_constant (attr))
11182 *offset = dwarf2_get_attr_constant_value (attr, 0);
11183 else if (attr_form_is_section_offset (attr))
11184 dwarf2_complex_location_expr_complaint ();
11185 else if (attr_form_is_block (attr))
11186 *offset = decode_locdesc (DW_BLOCK (attr), cu);
11188 dwarf2_complex_location_expr_complaint ();
11196 /* Add an aggregate field to the field list. */
11199 dwarf2_add_field (struct field_info *fip, struct die_info *die,
11200 struct dwarf2_cu *cu)
11202 struct objfile *objfile = cu->objfile;
11203 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11204 struct nextfield *new_field;
11205 struct attribute *attr;
11207 const char *fieldname = "";
11209 /* Allocate a new field list entry and link it in. */
11210 new_field = (struct nextfield *) xmalloc (sizeof (struct nextfield));
11211 make_cleanup (xfree, new_field);
11212 memset (new_field, 0, sizeof (struct nextfield));
11214 if (die->tag == DW_TAG_inheritance)
11216 new_field->next = fip->baseclasses;
11217 fip->baseclasses = new_field;
11221 new_field->next = fip->fields;
11222 fip->fields = new_field;
11226 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
11228 new_field->accessibility = DW_UNSND (attr);
11230 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
11231 if (new_field->accessibility != DW_ACCESS_public)
11232 fip->non_public_fields = 1;
11234 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
11236 new_field->virtuality = DW_UNSND (attr);
11238 new_field->virtuality = DW_VIRTUALITY_none;
11240 fp = &new_field->field;
11242 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
11246 /* Data member other than a C++ static data member. */
11248 /* Get type of field. */
11249 fp->type = die_type (die, cu);
11251 SET_FIELD_BITPOS (*fp, 0);
11253 /* Get bit size of field (zero if none). */
11254 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
11257 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
11261 FIELD_BITSIZE (*fp) = 0;
11264 /* Get bit offset of field. */
11265 if (handle_data_member_location (die, cu, &offset))
11266 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
11267 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
11270 if (gdbarch_bits_big_endian (gdbarch))
11272 /* For big endian bits, the DW_AT_bit_offset gives the
11273 additional bit offset from the MSB of the containing
11274 anonymous object to the MSB of the field. We don't
11275 have to do anything special since we don't need to
11276 know the size of the anonymous object. */
11277 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
11281 /* For little endian bits, compute the bit offset to the
11282 MSB of the anonymous object, subtract off the number of
11283 bits from the MSB of the field to the MSB of the
11284 object, and then subtract off the number of bits of
11285 the field itself. The result is the bit offset of
11286 the LSB of the field. */
11287 int anonymous_size;
11288 int bit_offset = DW_UNSND (attr);
11290 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
11293 /* The size of the anonymous object containing
11294 the bit field is explicit, so use the
11295 indicated size (in bytes). */
11296 anonymous_size = DW_UNSND (attr);
11300 /* The size of the anonymous object containing
11301 the bit field must be inferred from the type
11302 attribute of the data member containing the
11304 anonymous_size = TYPE_LENGTH (fp->type);
11306 SET_FIELD_BITPOS (*fp,
11307 (FIELD_BITPOS (*fp)
11308 + anonymous_size * bits_per_byte
11309 - bit_offset - FIELD_BITSIZE (*fp)));
11313 /* Get name of field. */
11314 fieldname = dwarf2_name (die, cu);
11315 if (fieldname == NULL)
11318 /* The name is already allocated along with this objfile, so we don't
11319 need to duplicate it for the type. */
11320 fp->name = fieldname;
11322 /* Change accessibility for artificial fields (e.g. virtual table
11323 pointer or virtual base class pointer) to private. */
11324 if (dwarf2_attr (die, DW_AT_artificial, cu))
11326 FIELD_ARTIFICIAL (*fp) = 1;
11327 new_field->accessibility = DW_ACCESS_private;
11328 fip->non_public_fields = 1;
11331 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
11333 /* C++ static member. */
11335 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
11336 is a declaration, but all versions of G++ as of this writing
11337 (so through at least 3.2.1) incorrectly generate
11338 DW_TAG_variable tags. */
11340 const char *physname;
11342 /* Get name of field. */
11343 fieldname = dwarf2_name (die, cu);
11344 if (fieldname == NULL)
11347 attr = dwarf2_attr (die, DW_AT_const_value, cu);
11349 /* Only create a symbol if this is an external value.
11350 new_symbol checks this and puts the value in the global symbol
11351 table, which we want. If it is not external, new_symbol
11352 will try to put the value in cu->list_in_scope which is wrong. */
11353 && dwarf2_flag_true_p (die, DW_AT_external, cu))
11355 /* A static const member, not much different than an enum as far as
11356 we're concerned, except that we can support more types. */
11357 new_symbol (die, NULL, cu);
11360 /* Get physical name. */
11361 physname = dwarf2_physname (fieldname, die, cu);
11363 /* The name is already allocated along with this objfile, so we don't
11364 need to duplicate it for the type. */
11365 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
11366 FIELD_TYPE (*fp) = die_type (die, cu);
11367 FIELD_NAME (*fp) = fieldname;
11369 else if (die->tag == DW_TAG_inheritance)
11373 /* C++ base class field. */
11374 if (handle_data_member_location (die, cu, &offset))
11375 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
11376 FIELD_BITSIZE (*fp) = 0;
11377 FIELD_TYPE (*fp) = die_type (die, cu);
11378 FIELD_NAME (*fp) = type_name_no_tag (fp->type);
11379 fip->nbaseclasses++;
11383 /* Add a typedef defined in the scope of the FIP's class. */
11386 dwarf2_add_typedef (struct field_info *fip, struct die_info *die,
11387 struct dwarf2_cu *cu)
11389 struct objfile *objfile = cu->objfile;
11390 struct typedef_field_list *new_field;
11391 struct attribute *attr;
11392 struct typedef_field *fp;
11393 char *fieldname = "";
11395 /* Allocate a new field list entry and link it in. */
11396 new_field = xzalloc (sizeof (*new_field));
11397 make_cleanup (xfree, new_field);
11399 gdb_assert (die->tag == DW_TAG_typedef);
11401 fp = &new_field->field;
11403 /* Get name of field. */
11404 fp->name = dwarf2_name (die, cu);
11405 if (fp->name == NULL)
11408 fp->type = read_type_die (die, cu);
11410 new_field->next = fip->typedef_field_list;
11411 fip->typedef_field_list = new_field;
11412 fip->typedef_field_list_count++;
11415 /* Create the vector of fields, and attach it to the type. */
11418 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
11419 struct dwarf2_cu *cu)
11421 int nfields = fip->nfields;
11423 /* Record the field count, allocate space for the array of fields,
11424 and create blank accessibility bitfields if necessary. */
11425 TYPE_NFIELDS (type) = nfields;
11426 TYPE_FIELDS (type) = (struct field *)
11427 TYPE_ALLOC (type, sizeof (struct field) * nfields);
11428 memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);
11430 if (fip->non_public_fields && cu->language != language_ada)
11432 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11434 TYPE_FIELD_PRIVATE_BITS (type) =
11435 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
11436 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
11438 TYPE_FIELD_PROTECTED_BITS (type) =
11439 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
11440 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
11442 TYPE_FIELD_IGNORE_BITS (type) =
11443 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
11444 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
11447 /* If the type has baseclasses, allocate and clear a bit vector for
11448 TYPE_FIELD_VIRTUAL_BITS. */
11449 if (fip->nbaseclasses && cu->language != language_ada)
11451 int num_bytes = B_BYTES (fip->nbaseclasses);
11452 unsigned char *pointer;
11454 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11455 pointer = TYPE_ALLOC (type, num_bytes);
11456 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
11457 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses);
11458 TYPE_N_BASECLASSES (type) = fip->nbaseclasses;
11461 /* Copy the saved-up fields into the field vector. Start from the head of
11462 the list, adding to the tail of the field array, so that they end up in
11463 the same order in the array in which they were added to the list. */
11464 while (nfields-- > 0)
11466 struct nextfield *fieldp;
11470 fieldp = fip->fields;
11471 fip->fields = fieldp->next;
11475 fieldp = fip->baseclasses;
11476 fip->baseclasses = fieldp->next;
11479 TYPE_FIELD (type, nfields) = fieldp->field;
11480 switch (fieldp->accessibility)
11482 case DW_ACCESS_private:
11483 if (cu->language != language_ada)
11484 SET_TYPE_FIELD_PRIVATE (type, nfields);
11487 case DW_ACCESS_protected:
11488 if (cu->language != language_ada)
11489 SET_TYPE_FIELD_PROTECTED (type, nfields);
11492 case DW_ACCESS_public:
11496 /* Unknown accessibility. Complain and treat it as public. */
11498 complaint (&symfile_complaints, _("unsupported accessibility %d"),
11499 fieldp->accessibility);
11503 if (nfields < fip->nbaseclasses)
11505 switch (fieldp->virtuality)
11507 case DW_VIRTUALITY_virtual:
11508 case DW_VIRTUALITY_pure_virtual:
11509 if (cu->language == language_ada)
11510 error (_("unexpected virtuality in component of Ada type"));
11511 SET_TYPE_FIELD_VIRTUAL (type, nfields);
11518 /* Return true if this member function is a constructor, false
11522 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
11524 const char *fieldname;
11525 const char *typename;
11528 if (die->parent == NULL)
11531 if (die->parent->tag != DW_TAG_structure_type
11532 && die->parent->tag != DW_TAG_union_type
11533 && die->parent->tag != DW_TAG_class_type)
11536 fieldname = dwarf2_name (die, cu);
11537 typename = dwarf2_name (die->parent, cu);
11538 if (fieldname == NULL || typename == NULL)
11541 len = strlen (fieldname);
11542 return (strncmp (fieldname, typename, len) == 0
11543 && (typename[len] == '\0' || typename[len] == '<'));
11546 /* Add a member function to the proper fieldlist. */
11549 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
11550 struct type *type, struct dwarf2_cu *cu)
11552 struct objfile *objfile = cu->objfile;
11553 struct attribute *attr;
11554 struct fnfieldlist *flp;
11556 struct fn_field *fnp;
11557 const char *fieldname;
11558 struct nextfnfield *new_fnfield;
11559 struct type *this_type;
11560 enum dwarf_access_attribute accessibility;
11562 if (cu->language == language_ada)
11563 error (_("unexpected member function in Ada type"));
11565 /* Get name of member function. */
11566 fieldname = dwarf2_name (die, cu);
11567 if (fieldname == NULL)
11570 /* Look up member function name in fieldlist. */
11571 for (i = 0; i < fip->nfnfields; i++)
11573 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
11577 /* Create new list element if necessary. */
11578 if (i < fip->nfnfields)
11579 flp = &fip->fnfieldlists[i];
11582 if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0)
11584 fip->fnfieldlists = (struct fnfieldlist *)
11585 xrealloc (fip->fnfieldlists,
11586 (fip->nfnfields + DW_FIELD_ALLOC_CHUNK)
11587 * sizeof (struct fnfieldlist));
11588 if (fip->nfnfields == 0)
11589 make_cleanup (free_current_contents, &fip->fnfieldlists);
11591 flp = &fip->fnfieldlists[fip->nfnfields];
11592 flp->name = fieldname;
11595 i = fip->nfnfields++;
11598 /* Create a new member function field and chain it to the field list
11600 new_fnfield = (struct nextfnfield *) xmalloc (sizeof (struct nextfnfield));
11601 make_cleanup (xfree, new_fnfield);
11602 memset (new_fnfield, 0, sizeof (struct nextfnfield));
11603 new_fnfield->next = flp->head;
11604 flp->head = new_fnfield;
11607 /* Fill in the member function field info. */
11608 fnp = &new_fnfield->fnfield;
11610 /* Delay processing of the physname until later. */
11611 if (cu->language == language_cplus || cu->language == language_java)
11613 add_to_method_list (type, i, flp->length - 1, fieldname,
11618 const char *physname = dwarf2_physname (fieldname, die, cu);
11619 fnp->physname = physname ? physname : "";
11622 fnp->type = alloc_type (objfile);
11623 this_type = read_type_die (die, cu);
11624 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
11626 int nparams = TYPE_NFIELDS (this_type);
11628 /* TYPE is the domain of this method, and THIS_TYPE is the type
11629 of the method itself (TYPE_CODE_METHOD). */
11630 smash_to_method_type (fnp->type, type,
11631 TYPE_TARGET_TYPE (this_type),
11632 TYPE_FIELDS (this_type),
11633 TYPE_NFIELDS (this_type),
11634 TYPE_VARARGS (this_type));
11636 /* Handle static member functions.
11637 Dwarf2 has no clean way to discern C++ static and non-static
11638 member functions. G++ helps GDB by marking the first
11639 parameter for non-static member functions (which is the this
11640 pointer) as artificial. We obtain this information from
11641 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
11642 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
11643 fnp->voffset = VOFFSET_STATIC;
11646 complaint (&symfile_complaints, _("member function type missing for '%s'"),
11647 dwarf2_full_name (fieldname, die, cu));
11649 /* Get fcontext from DW_AT_containing_type if present. */
11650 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
11651 fnp->fcontext = die_containing_type (die, cu);
11653 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
11654 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
11656 /* Get accessibility. */
11657 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
11659 accessibility = DW_UNSND (attr);
11661 accessibility = dwarf2_default_access_attribute (die, cu);
11662 switch (accessibility)
11664 case DW_ACCESS_private:
11665 fnp->is_private = 1;
11667 case DW_ACCESS_protected:
11668 fnp->is_protected = 1;
11672 /* Check for artificial methods. */
11673 attr = dwarf2_attr (die, DW_AT_artificial, cu);
11674 if (attr && DW_UNSND (attr) != 0)
11675 fnp->is_artificial = 1;
11677 fnp->is_constructor = dwarf2_is_constructor (die, cu);
11679 /* Get index in virtual function table if it is a virtual member
11680 function. For older versions of GCC, this is an offset in the
11681 appropriate virtual table, as specified by DW_AT_containing_type.
11682 For everyone else, it is an expression to be evaluated relative
11683 to the object address. */
11685 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
11688 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
11690 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
11692 /* Old-style GCC. */
11693 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
11695 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
11696 || (DW_BLOCK (attr)->size > 1
11697 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
11698 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
11700 struct dwarf_block blk;
11703 offset = (DW_BLOCK (attr)->data[0] == DW_OP_deref
11705 blk.size = DW_BLOCK (attr)->size - offset;
11706 blk.data = DW_BLOCK (attr)->data + offset;
11707 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
11708 if ((fnp->voffset % cu->header.addr_size) != 0)
11709 dwarf2_complex_location_expr_complaint ();
11711 fnp->voffset /= cu->header.addr_size;
11715 dwarf2_complex_location_expr_complaint ();
11717 if (!fnp->fcontext)
11718 fnp->fcontext = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
11720 else if (attr_form_is_section_offset (attr))
11722 dwarf2_complex_location_expr_complaint ();
11726 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
11732 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
11733 if (attr && DW_UNSND (attr))
11735 /* GCC does this, as of 2008-08-25; PR debug/37237. */
11736 complaint (&symfile_complaints,
11737 _("Member function \"%s\" (offset %d) is virtual "
11738 "but the vtable offset is not specified"),
11739 fieldname, die->offset.sect_off);
11740 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11741 TYPE_CPLUS_DYNAMIC (type) = 1;
11746 /* Create the vector of member function fields, and attach it to the type. */
11749 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
11750 struct dwarf2_cu *cu)
11752 struct fnfieldlist *flp;
11755 if (cu->language == language_ada)
11756 error (_("unexpected member functions in Ada type"));
11758 ALLOCATE_CPLUS_STRUCT_TYPE (type);
11759 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
11760 TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields);
11762 for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++)
11764 struct nextfnfield *nfp = flp->head;
11765 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
11768 TYPE_FN_FIELDLIST_NAME (type, i) = flp->name;
11769 TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length;
11770 fn_flp->fn_fields = (struct fn_field *)
11771 TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length);
11772 for (k = flp->length; (k--, nfp); nfp = nfp->next)
11773 fn_flp->fn_fields[k] = nfp->fnfield;
11776 TYPE_NFN_FIELDS (type) = fip->nfnfields;
11779 /* Returns non-zero if NAME is the name of a vtable member in CU's
11780 language, zero otherwise. */
11782 is_vtable_name (const char *name, struct dwarf2_cu *cu)
11784 static const char vptr[] = "_vptr";
11785 static const char vtable[] = "vtable";
11787 /* Look for the C++ and Java forms of the vtable. */
11788 if ((cu->language == language_java
11789 && strncmp (name, vtable, sizeof (vtable) - 1) == 0)
11790 || (strncmp (name, vptr, sizeof (vptr) - 1) == 0
11791 && is_cplus_marker (name[sizeof (vptr) - 1])))
11797 /* GCC outputs unnamed structures that are really pointers to member
11798 functions, with the ABI-specified layout. If TYPE describes
11799 such a structure, smash it into a member function type.
11801 GCC shouldn't do this; it should just output pointer to member DIEs.
11802 This is GCC PR debug/28767. */
11805 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
11807 struct type *pfn_type, *domain_type, *new_type;
11809 /* Check for a structure with no name and two children. */
11810 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
11813 /* Check for __pfn and __delta members. */
11814 if (TYPE_FIELD_NAME (type, 0) == NULL
11815 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
11816 || TYPE_FIELD_NAME (type, 1) == NULL
11817 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
11820 /* Find the type of the method. */
11821 pfn_type = TYPE_FIELD_TYPE (type, 0);
11822 if (pfn_type == NULL
11823 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
11824 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
11827 /* Look for the "this" argument. */
11828 pfn_type = TYPE_TARGET_TYPE (pfn_type);
11829 if (TYPE_NFIELDS (pfn_type) == 0
11830 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
11831 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
11834 domain_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
11835 new_type = alloc_type (objfile);
11836 smash_to_method_type (new_type, domain_type, TYPE_TARGET_TYPE (pfn_type),
11837 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
11838 TYPE_VARARGS (pfn_type));
11839 smash_to_methodptr_type (type, new_type);
11842 /* Return non-zero if the CU's PRODUCER string matches the Intel C/C++ compiler
11846 producer_is_icc (struct dwarf2_cu *cu)
11848 if (!cu->checked_producer)
11849 check_producer (cu);
11851 return cu->producer_is_icc;
11854 /* Called when we find the DIE that starts a structure or union scope
11855 (definition) to create a type for the structure or union. Fill in
11856 the type's name and general properties; the members will not be
11857 processed until process_structure_scope.
11859 NOTE: we need to call these functions regardless of whether or not the
11860 DIE has a DW_AT_name attribute, since it might be an anonymous
11861 structure or union. This gets the type entered into our set of
11862 user defined types.
11864 However, if the structure is incomplete (an opaque struct/union)
11865 then suppress creating a symbol table entry for it since gdb only
11866 wants to find the one with the complete definition. Note that if
11867 it is complete, we just call new_symbol, which does it's own
11868 checking about whether the struct/union is anonymous or not (and
11869 suppresses creating a symbol table entry itself). */
11871 static struct type *
11872 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
11874 struct objfile *objfile = cu->objfile;
11876 struct attribute *attr;
11879 /* If the definition of this type lives in .debug_types, read that type.
11880 Don't follow DW_AT_specification though, that will take us back up
11881 the chain and we want to go down. */
11882 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
11885 type = get_DW_AT_signature_type (die, attr, cu);
11887 /* The type's CU may not be the same as CU.
11888 Ensure TYPE is recorded with CU in die_type_hash. */
11889 return set_die_type (die, type, cu);
11892 type = alloc_type (objfile);
11893 INIT_CPLUS_SPECIFIC (type);
11895 name = dwarf2_name (die, cu);
11898 if (cu->language == language_cplus
11899 || cu->language == language_java)
11901 const char *full_name = dwarf2_full_name (name, die, cu);
11903 /* dwarf2_full_name might have already finished building the DIE's
11904 type. If so, there is no need to continue. */
11905 if (get_die_type (die, cu) != NULL)
11906 return get_die_type (die, cu);
11908 TYPE_TAG_NAME (type) = full_name;
11909 if (die->tag == DW_TAG_structure_type
11910 || die->tag == DW_TAG_class_type)
11911 TYPE_NAME (type) = TYPE_TAG_NAME (type);
11915 /* The name is already allocated along with this objfile, so
11916 we don't need to duplicate it for the type. */
11917 TYPE_TAG_NAME (type) = name;
11918 if (die->tag == DW_TAG_class_type)
11919 TYPE_NAME (type) = TYPE_TAG_NAME (type);
11923 if (die->tag == DW_TAG_structure_type)
11925 TYPE_CODE (type) = TYPE_CODE_STRUCT;
11927 else if (die->tag == DW_TAG_union_type)
11929 TYPE_CODE (type) = TYPE_CODE_UNION;
11933 TYPE_CODE (type) = TYPE_CODE_CLASS;
11936 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
11937 TYPE_DECLARED_CLASS (type) = 1;
11939 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
11942 TYPE_LENGTH (type) = DW_UNSND (attr);
11946 TYPE_LENGTH (type) = 0;
11949 if (producer_is_icc (cu))
11951 /* ICC does not output the required DW_AT_declaration
11952 on incomplete types, but gives them a size of zero. */
11955 TYPE_STUB_SUPPORTED (type) = 1;
11957 if (die_is_declaration (die, cu))
11958 TYPE_STUB (type) = 1;
11959 else if (attr == NULL && die->child == NULL
11960 && producer_is_realview (cu->producer))
11961 /* RealView does not output the required DW_AT_declaration
11962 on incomplete types. */
11963 TYPE_STUB (type) = 1;
11965 /* We need to add the type field to the die immediately so we don't
11966 infinitely recurse when dealing with pointers to the structure
11967 type within the structure itself. */
11968 set_die_type (die, type, cu);
11970 /* set_die_type should be already done. */
11971 set_descriptive_type (type, die, cu);
11976 /* Finish creating a structure or union type, including filling in
11977 its members and creating a symbol for it. */
11980 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
11982 struct objfile *objfile = cu->objfile;
11983 struct die_info *child_die = die->child;
11986 type = get_die_type (die, cu);
11988 type = read_structure_type (die, cu);
11990 if (die->child != NULL && ! die_is_declaration (die, cu))
11992 struct field_info fi;
11993 struct die_info *child_die;
11994 VEC (symbolp) *template_args = NULL;
11995 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
11997 memset (&fi, 0, sizeof (struct field_info));
11999 child_die = die->child;
12001 while (child_die && child_die->tag)
12003 if (child_die->tag == DW_TAG_member
12004 || child_die->tag == DW_TAG_variable)
12006 /* NOTE: carlton/2002-11-05: A C++ static data member
12007 should be a DW_TAG_member that is a declaration, but
12008 all versions of G++ as of this writing (so through at
12009 least 3.2.1) incorrectly generate DW_TAG_variable
12010 tags for them instead. */
12011 dwarf2_add_field (&fi, child_die, cu);
12013 else if (child_die->tag == DW_TAG_subprogram)
12015 /* C++ member function. */
12016 dwarf2_add_member_fn (&fi, child_die, type, cu);
12018 else if (child_die->tag == DW_TAG_inheritance)
12020 /* C++ base class field. */
12021 dwarf2_add_field (&fi, child_die, cu);
12023 else if (child_die->tag == DW_TAG_typedef)
12024 dwarf2_add_typedef (&fi, child_die, cu);
12025 else if (child_die->tag == DW_TAG_template_type_param
12026 || child_die->tag == DW_TAG_template_value_param)
12028 struct symbol *arg = new_symbol (child_die, NULL, cu);
12031 VEC_safe_push (symbolp, template_args, arg);
12034 child_die = sibling_die (child_die);
12037 /* Attach template arguments to type. */
12038 if (! VEC_empty (symbolp, template_args))
12040 ALLOCATE_CPLUS_STRUCT_TYPE (type);
12041 TYPE_N_TEMPLATE_ARGUMENTS (type)
12042 = VEC_length (symbolp, template_args);
12043 TYPE_TEMPLATE_ARGUMENTS (type)
12044 = obstack_alloc (&objfile->objfile_obstack,
12045 (TYPE_N_TEMPLATE_ARGUMENTS (type)
12046 * sizeof (struct symbol *)));
12047 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
12048 VEC_address (symbolp, template_args),
12049 (TYPE_N_TEMPLATE_ARGUMENTS (type)
12050 * sizeof (struct symbol *)));
12051 VEC_free (symbolp, template_args);
12054 /* Attach fields and member functions to the type. */
12056 dwarf2_attach_fields_to_type (&fi, type, cu);
12059 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
12061 /* Get the type which refers to the base class (possibly this
12062 class itself) which contains the vtable pointer for the current
12063 class from the DW_AT_containing_type attribute. This use of
12064 DW_AT_containing_type is a GNU extension. */
12066 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
12068 struct type *t = die_containing_type (die, cu);
12070 TYPE_VPTR_BASETYPE (type) = t;
12075 /* Our own class provides vtbl ptr. */
12076 for (i = TYPE_NFIELDS (t) - 1;
12077 i >= TYPE_N_BASECLASSES (t);
12080 const char *fieldname = TYPE_FIELD_NAME (t, i);
12082 if (is_vtable_name (fieldname, cu))
12084 TYPE_VPTR_FIELDNO (type) = i;
12089 /* Complain if virtual function table field not found. */
12090 if (i < TYPE_N_BASECLASSES (t))
12091 complaint (&symfile_complaints,
12092 _("virtual function table pointer "
12093 "not found when defining class '%s'"),
12094 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) :
12099 TYPE_VPTR_FIELDNO (type) = TYPE_VPTR_FIELDNO (t);
12102 else if (cu->producer
12103 && strncmp (cu->producer,
12104 "IBM(R) XL C/C++ Advanced Edition", 32) == 0)
12106 /* The IBM XLC compiler does not provide direct indication
12107 of the containing type, but the vtable pointer is
12108 always named __vfp. */
12112 for (i = TYPE_NFIELDS (type) - 1;
12113 i >= TYPE_N_BASECLASSES (type);
12116 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
12118 TYPE_VPTR_FIELDNO (type) = i;
12119 TYPE_VPTR_BASETYPE (type) = type;
12126 /* Copy fi.typedef_field_list linked list elements content into the
12127 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
12128 if (fi.typedef_field_list)
12130 int i = fi.typedef_field_list_count;
12132 ALLOCATE_CPLUS_STRUCT_TYPE (type);
12133 TYPE_TYPEDEF_FIELD_ARRAY (type)
12134 = TYPE_ALLOC (type, sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * i);
12135 TYPE_TYPEDEF_FIELD_COUNT (type) = i;
12137 /* Reverse the list order to keep the debug info elements order. */
12140 struct typedef_field *dest, *src;
12142 dest = &TYPE_TYPEDEF_FIELD (type, i);
12143 src = &fi.typedef_field_list->field;
12144 fi.typedef_field_list = fi.typedef_field_list->next;
12149 do_cleanups (back_to);
12151 if (HAVE_CPLUS_STRUCT (type))
12152 TYPE_CPLUS_REALLY_JAVA (type) = cu->language == language_java;
12155 quirk_gcc_member_function_pointer (type, objfile);
12157 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
12158 snapshots) has been known to create a die giving a declaration
12159 for a class that has, as a child, a die giving a definition for a
12160 nested class. So we have to process our children even if the
12161 current die is a declaration. Normally, of course, a declaration
12162 won't have any children at all. */
12164 while (child_die != NULL && child_die->tag)
12166 if (child_die->tag == DW_TAG_member
12167 || child_die->tag == DW_TAG_variable
12168 || child_die->tag == DW_TAG_inheritance
12169 || child_die->tag == DW_TAG_template_value_param
12170 || child_die->tag == DW_TAG_template_type_param)
12175 process_die (child_die, cu);
12177 child_die = sibling_die (child_die);
12180 /* Do not consider external references. According to the DWARF standard,
12181 these DIEs are identified by the fact that they have no byte_size
12182 attribute, and a declaration attribute. */
12183 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
12184 || !die_is_declaration (die, cu))
12185 new_symbol (die, type, cu);
12188 /* Given a DW_AT_enumeration_type die, set its type. We do not
12189 complete the type's fields yet, or create any symbols. */
12191 static struct type *
12192 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
12194 struct objfile *objfile = cu->objfile;
12196 struct attribute *attr;
12199 /* If the definition of this type lives in .debug_types, read that type.
12200 Don't follow DW_AT_specification though, that will take us back up
12201 the chain and we want to go down. */
12202 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
12205 type = get_DW_AT_signature_type (die, attr, cu);
12207 /* The type's CU may not be the same as CU.
12208 Ensure TYPE is recorded with CU in die_type_hash. */
12209 return set_die_type (die, type, cu);
12212 type = alloc_type (objfile);
12214 TYPE_CODE (type) = TYPE_CODE_ENUM;
12215 name = dwarf2_full_name (NULL, die, cu);
12217 TYPE_TAG_NAME (type) = name;
12219 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12222 TYPE_LENGTH (type) = DW_UNSND (attr);
12226 TYPE_LENGTH (type) = 0;
12229 /* The enumeration DIE can be incomplete. In Ada, any type can be
12230 declared as private in the package spec, and then defined only
12231 inside the package body. Such types are known as Taft Amendment
12232 Types. When another package uses such a type, an incomplete DIE
12233 may be generated by the compiler. */
12234 if (die_is_declaration (die, cu))
12235 TYPE_STUB (type) = 1;
12237 return set_die_type (die, type, cu);
12240 /* Given a pointer to a die which begins an enumeration, process all
12241 the dies that define the members of the enumeration, and create the
12242 symbol for the enumeration type.
12244 NOTE: We reverse the order of the element list. */
12247 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
12249 struct type *this_type;
12251 this_type = get_die_type (die, cu);
12252 if (this_type == NULL)
12253 this_type = read_enumeration_type (die, cu);
12255 if (die->child != NULL)
12257 struct die_info *child_die;
12258 struct symbol *sym;
12259 struct field *fields = NULL;
12260 int num_fields = 0;
12261 int unsigned_enum = 1;
12266 child_die = die->child;
12267 while (child_die && child_die->tag)
12269 if (child_die->tag != DW_TAG_enumerator)
12271 process_die (child_die, cu);
12275 name = dwarf2_name (child_die, cu);
12278 sym = new_symbol (child_die, this_type, cu);
12279 if (SYMBOL_VALUE (sym) < 0)
12284 else if ((mask & SYMBOL_VALUE (sym)) != 0)
12287 mask |= SYMBOL_VALUE (sym);
12289 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
12291 fields = (struct field *)
12293 (num_fields + DW_FIELD_ALLOC_CHUNK)
12294 * sizeof (struct field));
12297 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
12298 FIELD_TYPE (fields[num_fields]) = NULL;
12299 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
12300 FIELD_BITSIZE (fields[num_fields]) = 0;
12306 child_die = sibling_die (child_die);
12311 TYPE_NFIELDS (this_type) = num_fields;
12312 TYPE_FIELDS (this_type) = (struct field *)
12313 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
12314 memcpy (TYPE_FIELDS (this_type), fields,
12315 sizeof (struct field) * num_fields);
12319 TYPE_UNSIGNED (this_type) = 1;
12321 TYPE_FLAG_ENUM (this_type) = 1;
12324 /* If we are reading an enum from a .debug_types unit, and the enum
12325 is a declaration, and the enum is not the signatured type in the
12326 unit, then we do not want to add a symbol for it. Adding a
12327 symbol would in some cases obscure the true definition of the
12328 enum, giving users an incomplete type when the definition is
12329 actually available. Note that we do not want to do this for all
12330 enums which are just declarations, because C++0x allows forward
12331 enum declarations. */
12332 if (cu->per_cu->is_debug_types
12333 && die_is_declaration (die, cu))
12335 struct signatured_type *sig_type;
12337 sig_type = (struct signatured_type *) cu->per_cu;
12338 gdb_assert (sig_type->type_offset_in_section.sect_off != 0);
12339 if (sig_type->type_offset_in_section.sect_off != die->offset.sect_off)
12343 new_symbol (die, this_type, cu);
12346 /* Extract all information from a DW_TAG_array_type DIE and put it in
12347 the DIE's type field. For now, this only handles one dimensional
12350 static struct type *
12351 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
12353 struct objfile *objfile = cu->objfile;
12354 struct die_info *child_die;
12356 struct type *element_type, *range_type, *index_type;
12357 struct type **range_types = NULL;
12358 struct attribute *attr;
12360 struct cleanup *back_to;
12363 element_type = die_type (die, cu);
12365 /* The die_type call above may have already set the type for this DIE. */
12366 type = get_die_type (die, cu);
12370 /* Irix 6.2 native cc creates array types without children for
12371 arrays with unspecified length. */
12372 if (die->child == NULL)
12374 index_type = objfile_type (objfile)->builtin_int;
12375 range_type = create_range_type (NULL, index_type, 0, -1);
12376 type = create_array_type (NULL, element_type, range_type);
12377 return set_die_type (die, type, cu);
12380 back_to = make_cleanup (null_cleanup, NULL);
12381 child_die = die->child;
12382 while (child_die && child_die->tag)
12384 if (child_die->tag == DW_TAG_subrange_type)
12386 struct type *child_type = read_type_die (child_die, cu);
12388 if (child_type != NULL)
12390 /* The range type was succesfully read. Save it for the
12391 array type creation. */
12392 if ((ndim % DW_FIELD_ALLOC_CHUNK) == 0)
12394 range_types = (struct type **)
12395 xrealloc (range_types, (ndim + DW_FIELD_ALLOC_CHUNK)
12396 * sizeof (struct type *));
12398 make_cleanup (free_current_contents, &range_types);
12400 range_types[ndim++] = child_type;
12403 child_die = sibling_die (child_die);
12406 /* Dwarf2 dimensions are output from left to right, create the
12407 necessary array types in backwards order. */
12409 type = element_type;
12411 if (read_array_order (die, cu) == DW_ORD_col_major)
12416 type = create_array_type (NULL, type, range_types[i++]);
12421 type = create_array_type (NULL, type, range_types[ndim]);
12424 /* Understand Dwarf2 support for vector types (like they occur on
12425 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
12426 array type. This is not part of the Dwarf2/3 standard yet, but a
12427 custom vendor extension. The main difference between a regular
12428 array and the vector variant is that vectors are passed by value
12430 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
12432 make_vector_type (type);
12434 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
12435 implementation may choose to implement triple vectors using this
12437 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12440 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
12441 TYPE_LENGTH (type) = DW_UNSND (attr);
12443 complaint (&symfile_complaints,
12444 _("DW_AT_byte_size for array type smaller "
12445 "than the total size of elements"));
12448 name = dwarf2_name (die, cu);
12450 TYPE_NAME (type) = name;
12452 /* Install the type in the die. */
12453 set_die_type (die, type, cu);
12455 /* set_die_type should be already done. */
12456 set_descriptive_type (type, die, cu);
12458 do_cleanups (back_to);
12463 static enum dwarf_array_dim_ordering
12464 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
12466 struct attribute *attr;
12468 attr = dwarf2_attr (die, DW_AT_ordering, cu);
12470 if (attr) return DW_SND (attr);
12472 /* GNU F77 is a special case, as at 08/2004 array type info is the
12473 opposite order to the dwarf2 specification, but data is still
12474 laid out as per normal fortran.
12476 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
12477 version checking. */
12479 if (cu->language == language_fortran
12480 && cu->producer && strstr (cu->producer, "GNU F77"))
12482 return DW_ORD_row_major;
12485 switch (cu->language_defn->la_array_ordering)
12487 case array_column_major:
12488 return DW_ORD_col_major;
12489 case array_row_major:
12491 return DW_ORD_row_major;
12495 /* Extract all information from a DW_TAG_set_type DIE and put it in
12496 the DIE's type field. */
12498 static struct type *
12499 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
12501 struct type *domain_type, *set_type;
12502 struct attribute *attr;
12504 domain_type = die_type (die, cu);
12506 /* The die_type call above may have already set the type for this DIE. */
12507 set_type = get_die_type (die, cu);
12511 set_type = create_set_type (NULL, domain_type);
12513 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12515 TYPE_LENGTH (set_type) = DW_UNSND (attr);
12517 return set_die_type (die, set_type, cu);
12520 /* A helper for read_common_block that creates a locexpr baton.
12521 SYM is the symbol which we are marking as computed.
12522 COMMON_DIE is the DIE for the common block.
12523 COMMON_LOC is the location expression attribute for the common
12525 MEMBER_LOC is the location expression attribute for the particular
12526 member of the common block that we are processing.
12527 CU is the CU from which the above come. */
12530 mark_common_block_symbol_computed (struct symbol *sym,
12531 struct die_info *common_die,
12532 struct attribute *common_loc,
12533 struct attribute *member_loc,
12534 struct dwarf2_cu *cu)
12536 struct objfile *objfile = dwarf2_per_objfile->objfile;
12537 struct dwarf2_locexpr_baton *baton;
12539 unsigned int cu_off;
12540 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
12541 LONGEST offset = 0;
12543 gdb_assert (common_loc && member_loc);
12544 gdb_assert (attr_form_is_block (common_loc));
12545 gdb_assert (attr_form_is_block (member_loc)
12546 || attr_form_is_constant (member_loc));
12548 baton = obstack_alloc (&objfile->objfile_obstack,
12549 sizeof (struct dwarf2_locexpr_baton));
12550 baton->per_cu = cu->per_cu;
12551 gdb_assert (baton->per_cu);
12553 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
12555 if (attr_form_is_constant (member_loc))
12557 offset = dwarf2_get_attr_constant_value (member_loc, 0);
12558 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
12561 baton->size += DW_BLOCK (member_loc)->size;
12563 ptr = obstack_alloc (&objfile->objfile_obstack, baton->size);
12566 *ptr++ = DW_OP_call4;
12567 cu_off = common_die->offset.sect_off - cu->per_cu->offset.sect_off;
12568 store_unsigned_integer (ptr, 4, byte_order, cu_off);
12571 if (attr_form_is_constant (member_loc))
12573 *ptr++ = DW_OP_addr;
12574 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
12575 ptr += cu->header.addr_size;
12579 /* We have to copy the data here, because DW_OP_call4 will only
12580 use a DW_AT_location attribute. */
12581 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
12582 ptr += DW_BLOCK (member_loc)->size;
12585 *ptr++ = DW_OP_plus;
12586 gdb_assert (ptr - baton->data == baton->size);
12588 SYMBOL_LOCATION_BATON (sym) = baton;
12589 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
12592 /* Create appropriate locally-scoped variables for all the
12593 DW_TAG_common_block entries. Also create a struct common_block
12594 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
12595 is used to sepate the common blocks name namespace from regular
12599 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
12601 struct attribute *attr;
12603 attr = dwarf2_attr (die, DW_AT_location, cu);
12606 /* Support the .debug_loc offsets. */
12607 if (attr_form_is_block (attr))
12611 else if (attr_form_is_section_offset (attr))
12613 dwarf2_complex_location_expr_complaint ();
12618 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
12619 "common block member");
12624 if (die->child != NULL)
12626 struct objfile *objfile = cu->objfile;
12627 struct die_info *child_die;
12628 size_t n_entries = 0, size;
12629 struct common_block *common_block;
12630 struct symbol *sym;
12632 for (child_die = die->child;
12633 child_die && child_die->tag;
12634 child_die = sibling_die (child_die))
12637 size = (sizeof (struct common_block)
12638 + (n_entries - 1) * sizeof (struct symbol *));
12639 common_block = obstack_alloc (&objfile->objfile_obstack, size);
12640 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
12641 common_block->n_entries = 0;
12643 for (child_die = die->child;
12644 child_die && child_die->tag;
12645 child_die = sibling_die (child_die))
12647 /* Create the symbol in the DW_TAG_common_block block in the current
12649 sym = new_symbol (child_die, NULL, cu);
12652 struct attribute *member_loc;
12654 common_block->contents[common_block->n_entries++] = sym;
12656 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
12660 /* GDB has handled this for a long time, but it is
12661 not specified by DWARF. It seems to have been
12662 emitted by gfortran at least as recently as:
12663 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
12664 complaint (&symfile_complaints,
12665 _("Variable in common block has "
12666 "DW_AT_data_member_location "
12667 "- DIE at 0x%x [in module %s]"),
12668 child_die->offset.sect_off,
12669 objfile_name (cu->objfile));
12671 if (attr_form_is_section_offset (member_loc))
12672 dwarf2_complex_location_expr_complaint ();
12673 else if (attr_form_is_constant (member_loc)
12674 || attr_form_is_block (member_loc))
12677 mark_common_block_symbol_computed (sym, die, attr,
12681 dwarf2_complex_location_expr_complaint ();
12686 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
12687 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
12691 /* Create a type for a C++ namespace. */
12693 static struct type *
12694 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
12696 struct objfile *objfile = cu->objfile;
12697 const char *previous_prefix, *name;
12701 /* For extensions, reuse the type of the original namespace. */
12702 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
12704 struct die_info *ext_die;
12705 struct dwarf2_cu *ext_cu = cu;
12707 ext_die = dwarf2_extension (die, &ext_cu);
12708 type = read_type_die (ext_die, ext_cu);
12710 /* EXT_CU may not be the same as CU.
12711 Ensure TYPE is recorded with CU in die_type_hash. */
12712 return set_die_type (die, type, cu);
12715 name = namespace_name (die, &is_anonymous, cu);
12717 /* Now build the name of the current namespace. */
12719 previous_prefix = determine_prefix (die, cu);
12720 if (previous_prefix[0] != '\0')
12721 name = typename_concat (&objfile->objfile_obstack,
12722 previous_prefix, name, 0, cu);
12724 /* Create the type. */
12725 type = init_type (TYPE_CODE_NAMESPACE, 0, 0, NULL,
12727 TYPE_NAME (type) = name;
12728 TYPE_TAG_NAME (type) = TYPE_NAME (type);
12730 return set_die_type (die, type, cu);
12733 /* Read a C++ namespace. */
12736 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
12738 struct objfile *objfile = cu->objfile;
12741 /* Add a symbol associated to this if we haven't seen the namespace
12742 before. Also, add a using directive if it's an anonymous
12745 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
12749 type = read_type_die (die, cu);
12750 new_symbol (die, type, cu);
12752 namespace_name (die, &is_anonymous, cu);
12755 const char *previous_prefix = determine_prefix (die, cu);
12757 cp_add_using_directive (previous_prefix, TYPE_NAME (type), NULL,
12758 NULL, NULL, 0, &objfile->objfile_obstack);
12762 if (die->child != NULL)
12764 struct die_info *child_die = die->child;
12766 while (child_die && child_die->tag)
12768 process_die (child_die, cu);
12769 child_die = sibling_die (child_die);
12774 /* Read a Fortran module as type. This DIE can be only a declaration used for
12775 imported module. Still we need that type as local Fortran "use ... only"
12776 declaration imports depend on the created type in determine_prefix. */
12778 static struct type *
12779 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
12781 struct objfile *objfile = cu->objfile;
12782 const char *module_name;
12785 module_name = dwarf2_name (die, cu);
12787 complaint (&symfile_complaints,
12788 _("DW_TAG_module has no name, offset 0x%x"),
12789 die->offset.sect_off);
12790 type = init_type (TYPE_CODE_MODULE, 0, 0, module_name, objfile);
12792 /* determine_prefix uses TYPE_TAG_NAME. */
12793 TYPE_TAG_NAME (type) = TYPE_NAME (type);
12795 return set_die_type (die, type, cu);
12798 /* Read a Fortran module. */
12801 read_module (struct die_info *die, struct dwarf2_cu *cu)
12803 struct die_info *child_die = die->child;
12805 while (child_die && child_die->tag)
12807 process_die (child_die, cu);
12808 child_die = sibling_die (child_die);
12812 /* Return the name of the namespace represented by DIE. Set
12813 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
12816 static const char *
12817 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
12819 struct die_info *current_die;
12820 const char *name = NULL;
12822 /* Loop through the extensions until we find a name. */
12824 for (current_die = die;
12825 current_die != NULL;
12826 current_die = dwarf2_extension (die, &cu))
12828 name = dwarf2_name (current_die, cu);
12833 /* Is it an anonymous namespace? */
12835 *is_anonymous = (name == NULL);
12837 name = CP_ANONYMOUS_NAMESPACE_STR;
12842 /* Extract all information from a DW_TAG_pointer_type DIE and add to
12843 the user defined type vector. */
12845 static struct type *
12846 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
12848 struct gdbarch *gdbarch = get_objfile_arch (cu->objfile);
12849 struct comp_unit_head *cu_header = &cu->header;
12851 struct attribute *attr_byte_size;
12852 struct attribute *attr_address_class;
12853 int byte_size, addr_class;
12854 struct type *target_type;
12856 target_type = die_type (die, cu);
12858 /* The die_type call above may have already set the type for this DIE. */
12859 type = get_die_type (die, cu);
12863 type = lookup_pointer_type (target_type);
12865 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
12866 if (attr_byte_size)
12867 byte_size = DW_UNSND (attr_byte_size);
12869 byte_size = cu_header->addr_size;
12871 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
12872 if (attr_address_class)
12873 addr_class = DW_UNSND (attr_address_class);
12875 addr_class = DW_ADDR_none;
12877 /* If the pointer size or address class is different than the
12878 default, create a type variant marked as such and set the
12879 length accordingly. */
12880 if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none)
12882 if (gdbarch_address_class_type_flags_p (gdbarch))
12886 type_flags = gdbarch_address_class_type_flags
12887 (gdbarch, byte_size, addr_class);
12888 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
12890 type = make_type_with_address_space (type, type_flags);
12892 else if (TYPE_LENGTH (type) != byte_size)
12894 complaint (&symfile_complaints,
12895 _("invalid pointer size %d"), byte_size);
12899 /* Should we also complain about unhandled address classes? */
12903 TYPE_LENGTH (type) = byte_size;
12904 return set_die_type (die, type, cu);
12907 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
12908 the user defined type vector. */
12910 static struct type *
12911 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
12914 struct type *to_type;
12915 struct type *domain;
12917 to_type = die_type (die, cu);
12918 domain = die_containing_type (die, cu);
12920 /* The calls above may have already set the type for this DIE. */
12921 type = get_die_type (die, cu);
12925 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
12926 type = lookup_methodptr_type (to_type);
12927 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
12929 struct type *new_type = alloc_type (cu->objfile);
12931 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
12932 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
12933 TYPE_VARARGS (to_type));
12934 type = lookup_methodptr_type (new_type);
12937 type = lookup_memberptr_type (to_type, domain);
12939 return set_die_type (die, type, cu);
12942 /* Extract all information from a DW_TAG_reference_type DIE and add to
12943 the user defined type vector. */
12945 static struct type *
12946 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu)
12948 struct comp_unit_head *cu_header = &cu->header;
12949 struct type *type, *target_type;
12950 struct attribute *attr;
12952 target_type = die_type (die, cu);
12954 /* The die_type call above may have already set the type for this DIE. */
12955 type = get_die_type (die, cu);
12959 type = lookup_reference_type (target_type);
12960 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
12963 TYPE_LENGTH (type) = DW_UNSND (attr);
12967 TYPE_LENGTH (type) = cu_header->addr_size;
12969 return set_die_type (die, type, cu);
12972 static struct type *
12973 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
12975 struct type *base_type, *cv_type;
12977 base_type = die_type (die, cu);
12979 /* The die_type call above may have already set the type for this DIE. */
12980 cv_type = get_die_type (die, cu);
12984 /* In case the const qualifier is applied to an array type, the element type
12985 is so qualified, not the array type (section 6.7.3 of C99). */
12986 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
12988 struct type *el_type, *inner_array;
12990 base_type = copy_type (base_type);
12991 inner_array = base_type;
12993 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
12995 TYPE_TARGET_TYPE (inner_array) =
12996 copy_type (TYPE_TARGET_TYPE (inner_array));
12997 inner_array = TYPE_TARGET_TYPE (inner_array);
13000 el_type = TYPE_TARGET_TYPE (inner_array);
13001 TYPE_TARGET_TYPE (inner_array) =
13002 make_cv_type (1, TYPE_VOLATILE (el_type), el_type, NULL);
13004 return set_die_type (die, base_type, cu);
13007 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
13008 return set_die_type (die, cv_type, cu);
13011 static struct type *
13012 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
13014 struct type *base_type, *cv_type;
13016 base_type = die_type (die, cu);
13018 /* The die_type call above may have already set the type for this DIE. */
13019 cv_type = get_die_type (die, cu);
13023 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
13024 return set_die_type (die, cv_type, cu);
13027 /* Handle DW_TAG_restrict_type. */
13029 static struct type *
13030 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
13032 struct type *base_type, *cv_type;
13034 base_type = die_type (die, cu);
13036 /* The die_type call above may have already set the type for this DIE. */
13037 cv_type = get_die_type (die, cu);
13041 cv_type = make_restrict_type (base_type);
13042 return set_die_type (die, cv_type, cu);
13045 /* Extract all information from a DW_TAG_string_type DIE and add to
13046 the user defined type vector. It isn't really a user defined type,
13047 but it behaves like one, with other DIE's using an AT_user_def_type
13048 attribute to reference it. */
13050 static struct type *
13051 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
13053 struct objfile *objfile = cu->objfile;
13054 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13055 struct type *type, *range_type, *index_type, *char_type;
13056 struct attribute *attr;
13057 unsigned int length;
13059 attr = dwarf2_attr (die, DW_AT_string_length, cu);
13062 length = DW_UNSND (attr);
13066 /* Check for the DW_AT_byte_size attribute. */
13067 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13070 length = DW_UNSND (attr);
13078 index_type = objfile_type (objfile)->builtin_int;
13079 range_type = create_range_type (NULL, index_type, 1, length);
13080 char_type = language_string_char_type (cu->language_defn, gdbarch);
13081 type = create_string_type (NULL, char_type, range_type);
13083 return set_die_type (die, type, cu);
13086 /* Assuming that DIE corresponds to a function, returns nonzero
13087 if the function is prototyped. */
13090 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
13092 struct attribute *attr;
13094 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
13095 if (attr && (DW_UNSND (attr) != 0))
13098 /* The DWARF standard implies that the DW_AT_prototyped attribute
13099 is only meaninful for C, but the concept also extends to other
13100 languages that allow unprototyped functions (Eg: Objective C).
13101 For all other languages, assume that functions are always
13103 if (cu->language != language_c
13104 && cu->language != language_objc
13105 && cu->language != language_opencl)
13108 /* RealView does not emit DW_AT_prototyped. We can not distinguish
13109 prototyped and unprototyped functions; default to prototyped,
13110 since that is more common in modern code (and RealView warns
13111 about unprototyped functions). */
13112 if (producer_is_realview (cu->producer))
13118 /* Handle DIES due to C code like:
13122 int (*funcp)(int a, long l);
13126 ('funcp' generates a DW_TAG_subroutine_type DIE). */
13128 static struct type *
13129 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
13131 struct objfile *objfile = cu->objfile;
13132 struct type *type; /* Type that this function returns. */
13133 struct type *ftype; /* Function that returns above type. */
13134 struct attribute *attr;
13136 type = die_type (die, cu);
13138 /* The die_type call above may have already set the type for this DIE. */
13139 ftype = get_die_type (die, cu);
13143 ftype = lookup_function_type (type);
13145 if (prototyped_function_p (die, cu))
13146 TYPE_PROTOTYPED (ftype) = 1;
13148 /* Store the calling convention in the type if it's available in
13149 the subroutine die. Otherwise set the calling convention to
13150 the default value DW_CC_normal. */
13151 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
13153 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
13154 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
13155 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
13157 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
13159 /* We need to add the subroutine type to the die immediately so
13160 we don't infinitely recurse when dealing with parameters
13161 declared as the same subroutine type. */
13162 set_die_type (die, ftype, cu);
13164 if (die->child != NULL)
13166 struct type *void_type = objfile_type (objfile)->builtin_void;
13167 struct die_info *child_die;
13168 int nparams, iparams;
13170 /* Count the number of parameters.
13171 FIXME: GDB currently ignores vararg functions, but knows about
13172 vararg member functions. */
13174 child_die = die->child;
13175 while (child_die && child_die->tag)
13177 if (child_die->tag == DW_TAG_formal_parameter)
13179 else if (child_die->tag == DW_TAG_unspecified_parameters)
13180 TYPE_VARARGS (ftype) = 1;
13181 child_die = sibling_die (child_die);
13184 /* Allocate storage for parameters and fill them in. */
13185 TYPE_NFIELDS (ftype) = nparams;
13186 TYPE_FIELDS (ftype) = (struct field *)
13187 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
13189 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
13190 even if we error out during the parameters reading below. */
13191 for (iparams = 0; iparams < nparams; iparams++)
13192 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
13195 child_die = die->child;
13196 while (child_die && child_die->tag)
13198 if (child_die->tag == DW_TAG_formal_parameter)
13200 struct type *arg_type;
13202 /* DWARF version 2 has no clean way to discern C++
13203 static and non-static member functions. G++ helps
13204 GDB by marking the first parameter for non-static
13205 member functions (which is the this pointer) as
13206 artificial. We pass this information to
13207 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
13209 DWARF version 3 added DW_AT_object_pointer, which GCC
13210 4.5 does not yet generate. */
13211 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
13213 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
13216 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
13218 /* GCC/43521: In java, the formal parameter
13219 "this" is sometimes not marked with DW_AT_artificial. */
13220 if (cu->language == language_java)
13222 const char *name = dwarf2_name (child_die, cu);
13224 if (name && !strcmp (name, "this"))
13225 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 1;
13228 arg_type = die_type (child_die, cu);
13230 /* RealView does not mark THIS as const, which the testsuite
13231 expects. GCC marks THIS as const in method definitions,
13232 but not in the class specifications (GCC PR 43053). */
13233 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
13234 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
13237 struct dwarf2_cu *arg_cu = cu;
13238 const char *name = dwarf2_name (child_die, cu);
13240 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
13243 /* If the compiler emits this, use it. */
13244 if (follow_die_ref (die, attr, &arg_cu) == child_die)
13247 else if (name && strcmp (name, "this") == 0)
13248 /* Function definitions will have the argument names. */
13250 else if (name == NULL && iparams == 0)
13251 /* Declarations may not have the names, so like
13252 elsewhere in GDB, assume an artificial first
13253 argument is "this". */
13257 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
13261 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
13264 child_die = sibling_die (child_die);
13271 static struct type *
13272 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
13274 struct objfile *objfile = cu->objfile;
13275 const char *name = NULL;
13276 struct type *this_type, *target_type;
13278 name = dwarf2_full_name (NULL, die, cu);
13279 this_type = init_type (TYPE_CODE_TYPEDEF, 0,
13280 TYPE_FLAG_TARGET_STUB, NULL, objfile);
13281 TYPE_NAME (this_type) = name;
13282 set_die_type (die, this_type, cu);
13283 target_type = die_type (die, cu);
13284 if (target_type != this_type)
13285 TYPE_TARGET_TYPE (this_type) = target_type;
13288 /* Self-referential typedefs are, it seems, not allowed by the DWARF
13289 spec and cause infinite loops in GDB. */
13290 complaint (&symfile_complaints,
13291 _("Self-referential DW_TAG_typedef "
13292 "- DIE at 0x%x [in module %s]"),
13293 die->offset.sect_off, objfile_name (objfile));
13294 TYPE_TARGET_TYPE (this_type) = NULL;
13299 /* Find a representation of a given base type and install
13300 it in the TYPE field of the die. */
13302 static struct type *
13303 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
13305 struct objfile *objfile = cu->objfile;
13307 struct attribute *attr;
13308 int encoding = 0, size = 0;
13310 enum type_code code = TYPE_CODE_INT;
13311 int type_flags = 0;
13312 struct type *target_type = NULL;
13314 attr = dwarf2_attr (die, DW_AT_encoding, cu);
13317 encoding = DW_UNSND (attr);
13319 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13322 size = DW_UNSND (attr);
13324 name = dwarf2_name (die, cu);
13327 complaint (&symfile_complaints,
13328 _("DW_AT_name missing from DW_TAG_base_type"));
13333 case DW_ATE_address:
13334 /* Turn DW_ATE_address into a void * pointer. */
13335 code = TYPE_CODE_PTR;
13336 type_flags |= TYPE_FLAG_UNSIGNED;
13337 target_type = init_type (TYPE_CODE_VOID, 1, 0, NULL, objfile);
13339 case DW_ATE_boolean:
13340 code = TYPE_CODE_BOOL;
13341 type_flags |= TYPE_FLAG_UNSIGNED;
13343 case DW_ATE_complex_float:
13344 code = TYPE_CODE_COMPLEX;
13345 target_type = init_type (TYPE_CODE_FLT, size / 2, 0, NULL, objfile);
13347 case DW_ATE_decimal_float:
13348 code = TYPE_CODE_DECFLOAT;
13351 code = TYPE_CODE_FLT;
13353 case DW_ATE_signed:
13355 case DW_ATE_unsigned:
13356 type_flags |= TYPE_FLAG_UNSIGNED;
13357 if (cu->language == language_fortran
13359 && strncmp (name, "character(", sizeof ("character(") - 1) == 0)
13360 code = TYPE_CODE_CHAR;
13362 case DW_ATE_signed_char:
13363 if (cu->language == language_ada || cu->language == language_m2
13364 || cu->language == language_pascal
13365 || cu->language == language_fortran)
13366 code = TYPE_CODE_CHAR;
13368 case DW_ATE_unsigned_char:
13369 if (cu->language == language_ada || cu->language == language_m2
13370 || cu->language == language_pascal
13371 || cu->language == language_fortran)
13372 code = TYPE_CODE_CHAR;
13373 type_flags |= TYPE_FLAG_UNSIGNED;
13376 /* We just treat this as an integer and then recognize the
13377 type by name elsewhere. */
13381 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"),
13382 dwarf_type_encoding_name (encoding));
13386 type = init_type (code, size, type_flags, NULL, objfile);
13387 TYPE_NAME (type) = name;
13388 TYPE_TARGET_TYPE (type) = target_type;
13390 if (name && strcmp (name, "char") == 0)
13391 TYPE_NOSIGN (type) = 1;
13393 return set_die_type (die, type, cu);
13396 /* Read the given DW_AT_subrange DIE. */
13398 static struct type *
13399 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
13401 struct type *base_type, *orig_base_type;
13402 struct type *range_type;
13403 struct attribute *attr;
13405 int low_default_is_valid;
13407 LONGEST negative_mask;
13409 orig_base_type = die_type (die, cu);
13410 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
13411 whereas the real type might be. So, we use ORIG_BASE_TYPE when
13412 creating the range type, but we use the result of check_typedef
13413 when examining properties of the type. */
13414 base_type = check_typedef (orig_base_type);
13416 /* The die_type call above may have already set the type for this DIE. */
13417 range_type = get_die_type (die, cu);
13421 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
13422 omitting DW_AT_lower_bound. */
13423 switch (cu->language)
13426 case language_cplus:
13428 low_default_is_valid = 1;
13430 case language_fortran:
13432 low_default_is_valid = 1;
13435 case language_java:
13436 case language_objc:
13438 low_default_is_valid = (cu->header.version >= 4);
13442 case language_pascal:
13444 low_default_is_valid = (cu->header.version >= 4);
13448 low_default_is_valid = 0;
13452 /* FIXME: For variable sized arrays either of these could be
13453 a variable rather than a constant value. We'll allow it,
13454 but we don't know how to handle it. */
13455 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
13457 low = dwarf2_get_attr_constant_value (attr, low);
13458 else if (!low_default_is_valid)
13459 complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
13460 "- DIE at 0x%x [in module %s]"),
13461 die->offset.sect_off, objfile_name (cu->objfile));
13463 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
13466 if (attr_form_is_block (attr) || attr_form_is_ref (attr))
13468 /* GCC encodes arrays with unspecified or dynamic length
13469 with a DW_FORM_block1 attribute or a reference attribute.
13470 FIXME: GDB does not yet know how to handle dynamic
13471 arrays properly, treat them as arrays with unspecified
13474 FIXME: jimb/2003-09-22: GDB does not really know
13475 how to handle arrays of unspecified length
13476 either; we just represent them as zero-length
13477 arrays. Choose an appropriate upper bound given
13478 the lower bound we've computed above. */
13482 high = dwarf2_get_attr_constant_value (attr, 1);
13486 attr = dwarf2_attr (die, DW_AT_count, cu);
13489 int count = dwarf2_get_attr_constant_value (attr, 1);
13490 high = low + count - 1;
13494 /* Unspecified array length. */
13499 /* Dwarf-2 specifications explicitly allows to create subrange types
13500 without specifying a base type.
13501 In that case, the base type must be set to the type of
13502 the lower bound, upper bound or count, in that order, if any of these
13503 three attributes references an object that has a type.
13504 If no base type is found, the Dwarf-2 specifications say that
13505 a signed integer type of size equal to the size of an address should
13507 For the following C code: `extern char gdb_int [];'
13508 GCC produces an empty range DIE.
13509 FIXME: muller/2010-05-28: Possible references to object for low bound,
13510 high bound or count are not yet handled by this code. */
13511 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
13513 struct objfile *objfile = cu->objfile;
13514 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13515 int addr_size = gdbarch_addr_bit (gdbarch) /8;
13516 struct type *int_type = objfile_type (objfile)->builtin_int;
13518 /* Test "int", "long int", and "long long int" objfile types,
13519 and select the first one having a size above or equal to the
13520 architecture address size. */
13521 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
13522 base_type = int_type;
13525 int_type = objfile_type (objfile)->builtin_long;
13526 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
13527 base_type = int_type;
13530 int_type = objfile_type (objfile)->builtin_long_long;
13531 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
13532 base_type = int_type;
13538 (LONGEST) -1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1);
13539 if (!TYPE_UNSIGNED (base_type) && (low & negative_mask))
13540 low |= negative_mask;
13541 if (!TYPE_UNSIGNED (base_type) && (high & negative_mask))
13542 high |= negative_mask;
13544 range_type = create_range_type (NULL, orig_base_type, low, high);
13546 /* Mark arrays with dynamic length at least as an array of unspecified
13547 length. GDB could check the boundary but before it gets implemented at
13548 least allow accessing the array elements. */
13549 if (attr && attr_form_is_block (attr))
13550 TYPE_HIGH_BOUND_UNDEFINED (range_type) = 1;
13552 /* Ada expects an empty array on no boundary attributes. */
13553 if (attr == NULL && cu->language != language_ada)
13554 TYPE_HIGH_BOUND_UNDEFINED (range_type) = 1;
13556 name = dwarf2_name (die, cu);
13558 TYPE_NAME (range_type) = name;
13560 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13562 TYPE_LENGTH (range_type) = DW_UNSND (attr);
13564 set_die_type (die, range_type, cu);
13566 /* set_die_type should be already done. */
13567 set_descriptive_type (range_type, die, cu);
13572 static struct type *
13573 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
13577 /* For now, we only support the C meaning of an unspecified type: void. */
13579 type = init_type (TYPE_CODE_VOID, 0, 0, NULL, cu->objfile);
13580 TYPE_NAME (type) = dwarf2_name (die, cu);
13582 return set_die_type (die, type, cu);
13585 /* Read a single die and all its descendents. Set the die's sibling
13586 field to NULL; set other fields in the die correctly, and set all
13587 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
13588 location of the info_ptr after reading all of those dies. PARENT
13589 is the parent of the die in question. */
13591 static struct die_info *
13592 read_die_and_children (const struct die_reader_specs *reader,
13593 const gdb_byte *info_ptr,
13594 const gdb_byte **new_info_ptr,
13595 struct die_info *parent)
13597 struct die_info *die;
13598 const gdb_byte *cur_ptr;
13601 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
13604 *new_info_ptr = cur_ptr;
13607 store_in_ref_table (die, reader->cu);
13610 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
13614 *new_info_ptr = cur_ptr;
13617 die->sibling = NULL;
13618 die->parent = parent;
13622 /* Read a die, all of its descendents, and all of its siblings; set
13623 all of the fields of all of the dies correctly. Arguments are as
13624 in read_die_and_children. */
13626 static struct die_info *
13627 read_die_and_siblings_1 (const struct die_reader_specs *reader,
13628 const gdb_byte *info_ptr,
13629 const gdb_byte **new_info_ptr,
13630 struct die_info *parent)
13632 struct die_info *first_die, *last_sibling;
13633 const gdb_byte *cur_ptr;
13635 cur_ptr = info_ptr;
13636 first_die = last_sibling = NULL;
13640 struct die_info *die
13641 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
13645 *new_info_ptr = cur_ptr;
13652 last_sibling->sibling = die;
13654 last_sibling = die;
13658 /* Read a die, all of its descendents, and all of its siblings; set
13659 all of the fields of all of the dies correctly. Arguments are as
13660 in read_die_and_children.
13661 This the main entry point for reading a DIE and all its children. */
13663 static struct die_info *
13664 read_die_and_siblings (const struct die_reader_specs *reader,
13665 const gdb_byte *info_ptr,
13666 const gdb_byte **new_info_ptr,
13667 struct die_info *parent)
13669 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
13670 new_info_ptr, parent);
13672 if (dwarf2_die_debug)
13674 fprintf_unfiltered (gdb_stdlog,
13675 "Read die from %s@0x%x of %s:\n",
13676 bfd_section_name (reader->abfd,
13677 reader->die_section->asection),
13678 (unsigned) (info_ptr - reader->die_section->buffer),
13679 bfd_get_filename (reader->abfd));
13680 dump_die (die, dwarf2_die_debug);
13686 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
13688 The caller is responsible for filling in the extra attributes
13689 and updating (*DIEP)->num_attrs.
13690 Set DIEP to point to a newly allocated die with its information,
13691 except for its child, sibling, and parent fields.
13692 Set HAS_CHILDREN to tell whether the die has children or not. */
13694 static const gdb_byte *
13695 read_full_die_1 (const struct die_reader_specs *reader,
13696 struct die_info **diep, const gdb_byte *info_ptr,
13697 int *has_children, int num_extra_attrs)
13699 unsigned int abbrev_number, bytes_read, i;
13700 sect_offset offset;
13701 struct abbrev_info *abbrev;
13702 struct die_info *die;
13703 struct dwarf2_cu *cu = reader->cu;
13704 bfd *abfd = reader->abfd;
13706 offset.sect_off = info_ptr - reader->buffer;
13707 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
13708 info_ptr += bytes_read;
13709 if (!abbrev_number)
13716 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
13718 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
13720 bfd_get_filename (abfd));
13722 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
13723 die->offset = offset;
13724 die->tag = abbrev->tag;
13725 die->abbrev = abbrev_number;
13727 /* Make the result usable.
13728 The caller needs to update num_attrs after adding the extra
13730 die->num_attrs = abbrev->num_attrs;
13732 for (i = 0; i < abbrev->num_attrs; ++i)
13733 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
13737 *has_children = abbrev->has_children;
13741 /* Read a die and all its attributes.
13742 Set DIEP to point to a newly allocated die with its information,
13743 except for its child, sibling, and parent fields.
13744 Set HAS_CHILDREN to tell whether the die has children or not. */
13746 static const gdb_byte *
13747 read_full_die (const struct die_reader_specs *reader,
13748 struct die_info **diep, const gdb_byte *info_ptr,
13751 const gdb_byte *result;
13753 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
13755 if (dwarf2_die_debug)
13757 fprintf_unfiltered (gdb_stdlog,
13758 "Read die from %s@0x%x of %s:\n",
13759 bfd_section_name (reader->abfd,
13760 reader->die_section->asection),
13761 (unsigned) (info_ptr - reader->die_section->buffer),
13762 bfd_get_filename (reader->abfd));
13763 dump_die (*diep, dwarf2_die_debug);
13769 /* Abbreviation tables.
13771 In DWARF version 2, the description of the debugging information is
13772 stored in a separate .debug_abbrev section. Before we read any
13773 dies from a section we read in all abbreviations and install them
13774 in a hash table. */
13776 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
13778 static struct abbrev_info *
13779 abbrev_table_alloc_abbrev (struct abbrev_table *abbrev_table)
13781 struct abbrev_info *abbrev;
13783 abbrev = (struct abbrev_info *)
13784 obstack_alloc (&abbrev_table->abbrev_obstack, sizeof (struct abbrev_info));
13785 memset (abbrev, 0, sizeof (struct abbrev_info));
13789 /* Add an abbreviation to the table. */
13792 abbrev_table_add_abbrev (struct abbrev_table *abbrev_table,
13793 unsigned int abbrev_number,
13794 struct abbrev_info *abbrev)
13796 unsigned int hash_number;
13798 hash_number = abbrev_number % ABBREV_HASH_SIZE;
13799 abbrev->next = abbrev_table->abbrevs[hash_number];
13800 abbrev_table->abbrevs[hash_number] = abbrev;
13803 /* Look up an abbrev in the table.
13804 Returns NULL if the abbrev is not found. */
13806 static struct abbrev_info *
13807 abbrev_table_lookup_abbrev (const struct abbrev_table *abbrev_table,
13808 unsigned int abbrev_number)
13810 unsigned int hash_number;
13811 struct abbrev_info *abbrev;
13813 hash_number = abbrev_number % ABBREV_HASH_SIZE;
13814 abbrev = abbrev_table->abbrevs[hash_number];
13818 if (abbrev->number == abbrev_number)
13820 abbrev = abbrev->next;
13825 /* Read in an abbrev table. */
13827 static struct abbrev_table *
13828 abbrev_table_read_table (struct dwarf2_section_info *section,
13829 sect_offset offset)
13831 struct objfile *objfile = dwarf2_per_objfile->objfile;
13832 bfd *abfd = section->asection->owner;
13833 struct abbrev_table *abbrev_table;
13834 const gdb_byte *abbrev_ptr;
13835 struct abbrev_info *cur_abbrev;
13836 unsigned int abbrev_number, bytes_read, abbrev_name;
13837 unsigned int abbrev_form;
13838 struct attr_abbrev *cur_attrs;
13839 unsigned int allocated_attrs;
13841 abbrev_table = XMALLOC (struct abbrev_table);
13842 abbrev_table->offset = offset;
13843 obstack_init (&abbrev_table->abbrev_obstack);
13844 abbrev_table->abbrevs = obstack_alloc (&abbrev_table->abbrev_obstack,
13846 * sizeof (struct abbrev_info *)));
13847 memset (abbrev_table->abbrevs, 0,
13848 ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
13850 dwarf2_read_section (objfile, section);
13851 abbrev_ptr = section->buffer + offset.sect_off;
13852 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13853 abbrev_ptr += bytes_read;
13855 allocated_attrs = ATTR_ALLOC_CHUNK;
13856 cur_attrs = xmalloc (allocated_attrs * sizeof (struct attr_abbrev));
13858 /* Loop until we reach an abbrev number of 0. */
13859 while (abbrev_number)
13861 cur_abbrev = abbrev_table_alloc_abbrev (abbrev_table);
13863 /* read in abbrev header */
13864 cur_abbrev->number = abbrev_number;
13865 cur_abbrev->tag = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13866 abbrev_ptr += bytes_read;
13867 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
13870 /* now read in declarations */
13871 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13872 abbrev_ptr += bytes_read;
13873 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13874 abbrev_ptr += bytes_read;
13875 while (abbrev_name)
13877 if (cur_abbrev->num_attrs == allocated_attrs)
13879 allocated_attrs += ATTR_ALLOC_CHUNK;
13881 = xrealloc (cur_attrs, (allocated_attrs
13882 * sizeof (struct attr_abbrev)));
13885 cur_attrs[cur_abbrev->num_attrs].name = abbrev_name;
13886 cur_attrs[cur_abbrev->num_attrs++].form = abbrev_form;
13887 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13888 abbrev_ptr += bytes_read;
13889 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13890 abbrev_ptr += bytes_read;
13893 cur_abbrev->attrs = obstack_alloc (&abbrev_table->abbrev_obstack,
13894 (cur_abbrev->num_attrs
13895 * sizeof (struct attr_abbrev)));
13896 memcpy (cur_abbrev->attrs, cur_attrs,
13897 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
13899 abbrev_table_add_abbrev (abbrev_table, abbrev_number, cur_abbrev);
13901 /* Get next abbreviation.
13902 Under Irix6 the abbreviations for a compilation unit are not
13903 always properly terminated with an abbrev number of 0.
13904 Exit loop if we encounter an abbreviation which we have
13905 already read (which means we are about to read the abbreviations
13906 for the next compile unit) or if the end of the abbreviation
13907 table is reached. */
13908 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
13910 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
13911 abbrev_ptr += bytes_read;
13912 if (abbrev_table_lookup_abbrev (abbrev_table, abbrev_number) != NULL)
13917 return abbrev_table;
13920 /* Free the resources held by ABBREV_TABLE. */
13923 abbrev_table_free (struct abbrev_table *abbrev_table)
13925 obstack_free (&abbrev_table->abbrev_obstack, NULL);
13926 xfree (abbrev_table);
13929 /* Same as abbrev_table_free but as a cleanup.
13930 We pass in a pointer to the pointer to the table so that we can
13931 set the pointer to NULL when we're done. It also simplifies
13932 build_type_unit_groups. */
13935 abbrev_table_free_cleanup (void *table_ptr)
13937 struct abbrev_table **abbrev_table_ptr = table_ptr;
13939 if (*abbrev_table_ptr != NULL)
13940 abbrev_table_free (*abbrev_table_ptr);
13941 *abbrev_table_ptr = NULL;
13944 /* Read the abbrev table for CU from ABBREV_SECTION. */
13947 dwarf2_read_abbrevs (struct dwarf2_cu *cu,
13948 struct dwarf2_section_info *abbrev_section)
13951 abbrev_table_read_table (abbrev_section, cu->header.abbrev_offset);
13954 /* Release the memory used by the abbrev table for a compilation unit. */
13957 dwarf2_free_abbrev_table (void *ptr_to_cu)
13959 struct dwarf2_cu *cu = ptr_to_cu;
13961 if (cu->abbrev_table != NULL)
13962 abbrev_table_free (cu->abbrev_table);
13963 /* Set this to NULL so that we SEGV if we try to read it later,
13964 and also because free_comp_unit verifies this is NULL. */
13965 cu->abbrev_table = NULL;
13968 /* Returns nonzero if TAG represents a type that we might generate a partial
13972 is_type_tag_for_partial (int tag)
13977 /* Some types that would be reasonable to generate partial symbols for,
13978 that we don't at present. */
13979 case DW_TAG_array_type:
13980 case DW_TAG_file_type:
13981 case DW_TAG_ptr_to_member_type:
13982 case DW_TAG_set_type:
13983 case DW_TAG_string_type:
13984 case DW_TAG_subroutine_type:
13986 case DW_TAG_base_type:
13987 case DW_TAG_class_type:
13988 case DW_TAG_interface_type:
13989 case DW_TAG_enumeration_type:
13990 case DW_TAG_structure_type:
13991 case DW_TAG_subrange_type:
13992 case DW_TAG_typedef:
13993 case DW_TAG_union_type:
14000 /* Load all DIEs that are interesting for partial symbols into memory. */
14002 static struct partial_die_info *
14003 load_partial_dies (const struct die_reader_specs *reader,
14004 const gdb_byte *info_ptr, int building_psymtab)
14006 struct dwarf2_cu *cu = reader->cu;
14007 struct objfile *objfile = cu->objfile;
14008 struct partial_die_info *part_die;
14009 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
14010 struct abbrev_info *abbrev;
14011 unsigned int bytes_read;
14012 unsigned int load_all = 0;
14013 int nesting_level = 1;
14018 gdb_assert (cu->per_cu != NULL);
14019 if (cu->per_cu->load_all_dies)
14023 = htab_create_alloc_ex (cu->header.length / 12,
14027 &cu->comp_unit_obstack,
14028 hashtab_obstack_allocate,
14029 dummy_obstack_deallocate);
14031 part_die = obstack_alloc (&cu->comp_unit_obstack,
14032 sizeof (struct partial_die_info));
14036 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
14038 /* A NULL abbrev means the end of a series of children. */
14039 if (abbrev == NULL)
14041 if (--nesting_level == 0)
14043 /* PART_DIE was probably the last thing allocated on the
14044 comp_unit_obstack, so we could call obstack_free
14045 here. We don't do that because the waste is small,
14046 and will be cleaned up when we're done with this
14047 compilation unit. This way, we're also more robust
14048 against other users of the comp_unit_obstack. */
14051 info_ptr += bytes_read;
14052 last_die = parent_die;
14053 parent_die = parent_die->die_parent;
14057 /* Check for template arguments. We never save these; if
14058 they're seen, we just mark the parent, and go on our way. */
14059 if (parent_die != NULL
14060 && cu->language == language_cplus
14061 && (abbrev->tag == DW_TAG_template_type_param
14062 || abbrev->tag == DW_TAG_template_value_param))
14064 parent_die->has_template_arguments = 1;
14068 /* We don't need a partial DIE for the template argument. */
14069 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
14074 /* We only recurse into c++ subprograms looking for template arguments.
14075 Skip their other children. */
14077 && cu->language == language_cplus
14078 && parent_die != NULL
14079 && parent_die->tag == DW_TAG_subprogram)
14081 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
14085 /* Check whether this DIE is interesting enough to save. Normally
14086 we would not be interested in members here, but there may be
14087 later variables referencing them via DW_AT_specification (for
14088 static members). */
14090 && !is_type_tag_for_partial (abbrev->tag)
14091 && abbrev->tag != DW_TAG_constant
14092 && abbrev->tag != DW_TAG_enumerator
14093 && abbrev->tag != DW_TAG_subprogram
14094 && abbrev->tag != DW_TAG_lexical_block
14095 && abbrev->tag != DW_TAG_variable
14096 && abbrev->tag != DW_TAG_namespace
14097 && abbrev->tag != DW_TAG_module
14098 && abbrev->tag != DW_TAG_member
14099 && abbrev->tag != DW_TAG_imported_unit)
14101 /* Otherwise we skip to the next sibling, if any. */
14102 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
14106 info_ptr = read_partial_die (reader, part_die, abbrev, bytes_read,
14109 /* This two-pass algorithm for processing partial symbols has a
14110 high cost in cache pressure. Thus, handle some simple cases
14111 here which cover the majority of C partial symbols. DIEs
14112 which neither have specification tags in them, nor could have
14113 specification tags elsewhere pointing at them, can simply be
14114 processed and discarded.
14116 This segment is also optional; scan_partial_symbols and
14117 add_partial_symbol will handle these DIEs if we chain
14118 them in normally. When compilers which do not emit large
14119 quantities of duplicate debug information are more common,
14120 this code can probably be removed. */
14122 /* Any complete simple types at the top level (pretty much all
14123 of them, for a language without namespaces), can be processed
14125 if (parent_die == NULL
14126 && part_die->has_specification == 0
14127 && part_die->is_declaration == 0
14128 && ((part_die->tag == DW_TAG_typedef && !part_die->has_children)
14129 || part_die->tag == DW_TAG_base_type
14130 || part_die->tag == DW_TAG_subrange_type))
14132 if (building_psymtab && part_die->name != NULL)
14133 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
14134 VAR_DOMAIN, LOC_TYPEDEF,
14135 &objfile->static_psymbols,
14136 0, (CORE_ADDR) 0, cu->language, objfile);
14137 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
14141 /* The exception for DW_TAG_typedef with has_children above is
14142 a workaround of GCC PR debug/47510. In the case of this complaint
14143 type_name_no_tag_or_error will error on such types later.
14145 GDB skipped children of DW_TAG_typedef by the shortcut above and then
14146 it could not find the child DIEs referenced later, this is checked
14147 above. In correct DWARF DW_TAG_typedef should have no children. */
14149 if (part_die->tag == DW_TAG_typedef && part_die->has_children)
14150 complaint (&symfile_complaints,
14151 _("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
14152 "- DIE at 0x%x [in module %s]"),
14153 part_die->offset.sect_off, objfile_name (objfile));
14155 /* If we're at the second level, and we're an enumerator, and
14156 our parent has no specification (meaning possibly lives in a
14157 namespace elsewhere), then we can add the partial symbol now
14158 instead of queueing it. */
14159 if (part_die->tag == DW_TAG_enumerator
14160 && parent_die != NULL
14161 && parent_die->die_parent == NULL
14162 && parent_die->tag == DW_TAG_enumeration_type
14163 && parent_die->has_specification == 0)
14165 if (part_die->name == NULL)
14166 complaint (&symfile_complaints,
14167 _("malformed enumerator DIE ignored"));
14168 else if (building_psymtab)
14169 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
14170 VAR_DOMAIN, LOC_CONST,
14171 (cu->language == language_cplus
14172 || cu->language == language_java)
14173 ? &objfile->global_psymbols
14174 : &objfile->static_psymbols,
14175 0, (CORE_ADDR) 0, cu->language, objfile);
14177 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
14181 /* We'll save this DIE so link it in. */
14182 part_die->die_parent = parent_die;
14183 part_die->die_sibling = NULL;
14184 part_die->die_child = NULL;
14186 if (last_die && last_die == parent_die)
14187 last_die->die_child = part_die;
14189 last_die->die_sibling = part_die;
14191 last_die = part_die;
14193 if (first_die == NULL)
14194 first_die = part_die;
14196 /* Maybe add the DIE to the hash table. Not all DIEs that we
14197 find interesting need to be in the hash table, because we
14198 also have the parent/sibling/child chains; only those that we
14199 might refer to by offset later during partial symbol reading.
14201 For now this means things that might have be the target of a
14202 DW_AT_specification, DW_AT_abstract_origin, or
14203 DW_AT_extension. DW_AT_extension will refer only to
14204 namespaces; DW_AT_abstract_origin refers to functions (and
14205 many things under the function DIE, but we do not recurse
14206 into function DIEs during partial symbol reading) and
14207 possibly variables as well; DW_AT_specification refers to
14208 declarations. Declarations ought to have the DW_AT_declaration
14209 flag. It happens that GCC forgets to put it in sometimes, but
14210 only for functions, not for types.
14212 Adding more things than necessary to the hash table is harmless
14213 except for the performance cost. Adding too few will result in
14214 wasted time in find_partial_die, when we reread the compilation
14215 unit with load_all_dies set. */
14218 || abbrev->tag == DW_TAG_constant
14219 || abbrev->tag == DW_TAG_subprogram
14220 || abbrev->tag == DW_TAG_variable
14221 || abbrev->tag == DW_TAG_namespace
14222 || part_die->is_declaration)
14226 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
14227 part_die->offset.sect_off, INSERT);
14231 part_die = obstack_alloc (&cu->comp_unit_obstack,
14232 sizeof (struct partial_die_info));
14234 /* For some DIEs we want to follow their children (if any). For C
14235 we have no reason to follow the children of structures; for other
14236 languages we have to, so that we can get at method physnames
14237 to infer fully qualified class names, for DW_AT_specification,
14238 and for C++ template arguments. For C++, we also look one level
14239 inside functions to find template arguments (if the name of the
14240 function does not already contain the template arguments).
14242 For Ada, we need to scan the children of subprograms and lexical
14243 blocks as well because Ada allows the definition of nested
14244 entities that could be interesting for the debugger, such as
14245 nested subprograms for instance. */
14246 if (last_die->has_children
14248 || last_die->tag == DW_TAG_namespace
14249 || last_die->tag == DW_TAG_module
14250 || last_die->tag == DW_TAG_enumeration_type
14251 || (cu->language == language_cplus
14252 && last_die->tag == DW_TAG_subprogram
14253 && (last_die->name == NULL
14254 || strchr (last_die->name, '<') == NULL))
14255 || (cu->language != language_c
14256 && (last_die->tag == DW_TAG_class_type
14257 || last_die->tag == DW_TAG_interface_type
14258 || last_die->tag == DW_TAG_structure_type
14259 || last_die->tag == DW_TAG_union_type))
14260 || (cu->language == language_ada
14261 && (last_die->tag == DW_TAG_subprogram
14262 || last_die->tag == DW_TAG_lexical_block))))
14265 parent_die = last_die;
14269 /* Otherwise we skip to the next sibling, if any. */
14270 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
14272 /* Back to the top, do it again. */
14276 /* Read a minimal amount of information into the minimal die structure. */
14278 static const gdb_byte *
14279 read_partial_die (const struct die_reader_specs *reader,
14280 struct partial_die_info *part_die,
14281 struct abbrev_info *abbrev, unsigned int abbrev_len,
14282 const gdb_byte *info_ptr)
14284 struct dwarf2_cu *cu = reader->cu;
14285 struct objfile *objfile = cu->objfile;
14286 const gdb_byte *buffer = reader->buffer;
14288 struct attribute attr;
14289 int has_low_pc_attr = 0;
14290 int has_high_pc_attr = 0;
14291 int high_pc_relative = 0;
14293 memset (part_die, 0, sizeof (struct partial_die_info));
14295 part_die->offset.sect_off = info_ptr - buffer;
14297 info_ptr += abbrev_len;
14299 if (abbrev == NULL)
14302 part_die->tag = abbrev->tag;
14303 part_die->has_children = abbrev->has_children;
14305 for (i = 0; i < abbrev->num_attrs; ++i)
14307 info_ptr = read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
14309 /* Store the data if it is of an attribute we want to keep in a
14310 partial symbol table. */
14314 switch (part_die->tag)
14316 case DW_TAG_compile_unit:
14317 case DW_TAG_partial_unit:
14318 case DW_TAG_type_unit:
14319 /* Compilation units have a DW_AT_name that is a filename, not
14320 a source language identifier. */
14321 case DW_TAG_enumeration_type:
14322 case DW_TAG_enumerator:
14323 /* These tags always have simple identifiers already; no need
14324 to canonicalize them. */
14325 part_die->name = DW_STRING (&attr);
14329 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
14330 &objfile->objfile_obstack);
14334 case DW_AT_linkage_name:
14335 case DW_AT_MIPS_linkage_name:
14336 /* Note that both forms of linkage name might appear. We
14337 assume they will be the same, and we only store the last
14339 if (cu->language == language_ada)
14340 part_die->name = DW_STRING (&attr);
14341 part_die->linkage_name = DW_STRING (&attr);
14344 has_low_pc_attr = 1;
14345 part_die->lowpc = DW_ADDR (&attr);
14347 case DW_AT_high_pc:
14348 has_high_pc_attr = 1;
14349 if (attr.form == DW_FORM_addr
14350 || attr.form == DW_FORM_GNU_addr_index)
14351 part_die->highpc = DW_ADDR (&attr);
14354 high_pc_relative = 1;
14355 part_die->highpc = DW_UNSND (&attr);
14358 case DW_AT_location:
14359 /* Support the .debug_loc offsets. */
14360 if (attr_form_is_block (&attr))
14362 part_die->d.locdesc = DW_BLOCK (&attr);
14364 else if (attr_form_is_section_offset (&attr))
14366 dwarf2_complex_location_expr_complaint ();
14370 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
14371 "partial symbol information");
14374 case DW_AT_external:
14375 part_die->is_external = DW_UNSND (&attr);
14377 case DW_AT_declaration:
14378 part_die->is_declaration = DW_UNSND (&attr);
14381 part_die->has_type = 1;
14383 case DW_AT_abstract_origin:
14384 case DW_AT_specification:
14385 case DW_AT_extension:
14386 part_die->has_specification = 1;
14387 part_die->spec_offset = dwarf2_get_ref_die_offset (&attr);
14388 part_die->spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
14389 || cu->per_cu->is_dwz);
14391 case DW_AT_sibling:
14392 /* Ignore absolute siblings, they might point outside of
14393 the current compile unit. */
14394 if (attr.form == DW_FORM_ref_addr)
14395 complaint (&symfile_complaints,
14396 _("ignoring absolute DW_AT_sibling"));
14398 part_die->sibling = buffer + dwarf2_get_ref_die_offset (&attr).sect_off;
14400 case DW_AT_byte_size:
14401 part_die->has_byte_size = 1;
14403 case DW_AT_calling_convention:
14404 /* DWARF doesn't provide a way to identify a program's source-level
14405 entry point. DW_AT_calling_convention attributes are only meant
14406 to describe functions' calling conventions.
14408 However, because it's a necessary piece of information in
14409 Fortran, and because DW_CC_program is the only piece of debugging
14410 information whose definition refers to a 'main program' at all,
14411 several compilers have begun marking Fortran main programs with
14412 DW_CC_program --- even when those functions use the standard
14413 calling conventions.
14415 So until DWARF specifies a way to provide this information and
14416 compilers pick up the new representation, we'll support this
14418 if (DW_UNSND (&attr) == DW_CC_program
14419 && cu->language == language_fortran)
14421 set_main_name (part_die->name);
14423 /* As this DIE has a static linkage the name would be difficult
14424 to look up later. */
14425 language_of_main = language_fortran;
14429 if (DW_UNSND (&attr) == DW_INL_inlined
14430 || DW_UNSND (&attr) == DW_INL_declared_inlined)
14431 part_die->may_be_inlined = 1;
14435 if (part_die->tag == DW_TAG_imported_unit)
14437 part_die->d.offset = dwarf2_get_ref_die_offset (&attr);
14438 part_die->is_dwz = (attr.form == DW_FORM_GNU_ref_alt
14439 || cu->per_cu->is_dwz);
14448 if (high_pc_relative)
14449 part_die->highpc += part_die->lowpc;
14451 if (has_low_pc_attr && has_high_pc_attr)
14453 /* When using the GNU linker, .gnu.linkonce. sections are used to
14454 eliminate duplicate copies of functions and vtables and such.
14455 The linker will arbitrarily choose one and discard the others.
14456 The AT_*_pc values for such functions refer to local labels in
14457 these sections. If the section from that file was discarded, the
14458 labels are not in the output, so the relocs get a value of 0.
14459 If this is a discarded function, mark the pc bounds as invalid,
14460 so that GDB will ignore it. */
14461 if (part_die->lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
14463 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14465 complaint (&symfile_complaints,
14466 _("DW_AT_low_pc %s is zero "
14467 "for DIE at 0x%x [in module %s]"),
14468 paddress (gdbarch, part_die->lowpc),
14469 part_die->offset.sect_off, objfile_name (objfile));
14471 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
14472 else if (part_die->lowpc >= part_die->highpc)
14474 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14476 complaint (&symfile_complaints,
14477 _("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
14478 "for DIE at 0x%x [in module %s]"),
14479 paddress (gdbarch, part_die->lowpc),
14480 paddress (gdbarch, part_die->highpc),
14481 part_die->offset.sect_off, objfile_name (objfile));
14484 part_die->has_pc_info = 1;
14490 /* Find a cached partial DIE at OFFSET in CU. */
14492 static struct partial_die_info *
14493 find_partial_die_in_comp_unit (sect_offset offset, struct dwarf2_cu *cu)
14495 struct partial_die_info *lookup_die = NULL;
14496 struct partial_die_info part_die;
14498 part_die.offset = offset;
14499 lookup_die = htab_find_with_hash (cu->partial_dies, &part_die,
14505 /* Find a partial DIE at OFFSET, which may or may not be in CU,
14506 except in the case of .debug_types DIEs which do not reference
14507 outside their CU (they do however referencing other types via
14508 DW_FORM_ref_sig8). */
14510 static struct partial_die_info *
14511 find_partial_die (sect_offset offset, int offset_in_dwz, struct dwarf2_cu *cu)
14513 struct objfile *objfile = cu->objfile;
14514 struct dwarf2_per_cu_data *per_cu = NULL;
14515 struct partial_die_info *pd = NULL;
14517 if (offset_in_dwz == cu->per_cu->is_dwz
14518 && offset_in_cu_p (&cu->header, offset))
14520 pd = find_partial_die_in_comp_unit (offset, cu);
14523 /* We missed recording what we needed.
14524 Load all dies and try again. */
14525 per_cu = cu->per_cu;
14529 /* TUs don't reference other CUs/TUs (except via type signatures). */
14530 if (cu->per_cu->is_debug_types)
14532 error (_("Dwarf Error: Type Unit at offset 0x%lx contains"
14533 " external reference to offset 0x%lx [in module %s].\n"),
14534 (long) cu->header.offset.sect_off, (long) offset.sect_off,
14535 bfd_get_filename (objfile->obfd));
14537 per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz,
14540 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
14541 load_partial_comp_unit (per_cu);
14543 per_cu->cu->last_used = 0;
14544 pd = find_partial_die_in_comp_unit (offset, per_cu->cu);
14547 /* If we didn't find it, and not all dies have been loaded,
14548 load them all and try again. */
14550 if (pd == NULL && per_cu->load_all_dies == 0)
14552 per_cu->load_all_dies = 1;
14554 /* This is nasty. When we reread the DIEs, somewhere up the call chain
14555 THIS_CU->cu may already be in use. So we can't just free it and
14556 replace its DIEs with the ones we read in. Instead, we leave those
14557 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
14558 and clobber THIS_CU->cu->partial_dies with the hash table for the new
14560 load_partial_comp_unit (per_cu);
14562 pd = find_partial_die_in_comp_unit (offset, per_cu->cu);
14566 internal_error (__FILE__, __LINE__,
14567 _("could not find partial DIE 0x%x "
14568 "in cache [from module %s]\n"),
14569 offset.sect_off, bfd_get_filename (objfile->obfd));
14573 /* See if we can figure out if the class lives in a namespace. We do
14574 this by looking for a member function; its demangled name will
14575 contain namespace info, if there is any. */
14578 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
14579 struct dwarf2_cu *cu)
14581 /* NOTE: carlton/2003-10-07: Getting the info this way changes
14582 what template types look like, because the demangler
14583 frequently doesn't give the same name as the debug info. We
14584 could fix this by only using the demangled name to get the
14585 prefix (but see comment in read_structure_type). */
14587 struct partial_die_info *real_pdi;
14588 struct partial_die_info *child_pdi;
14590 /* If this DIE (this DIE's specification, if any) has a parent, then
14591 we should not do this. We'll prepend the parent's fully qualified
14592 name when we create the partial symbol. */
14594 real_pdi = struct_pdi;
14595 while (real_pdi->has_specification)
14596 real_pdi = find_partial_die (real_pdi->spec_offset,
14597 real_pdi->spec_is_dwz, cu);
14599 if (real_pdi->die_parent != NULL)
14602 for (child_pdi = struct_pdi->die_child;
14604 child_pdi = child_pdi->die_sibling)
14606 if (child_pdi->tag == DW_TAG_subprogram
14607 && child_pdi->linkage_name != NULL)
14609 char *actual_class_name
14610 = language_class_name_from_physname (cu->language_defn,
14611 child_pdi->linkage_name);
14612 if (actual_class_name != NULL)
14615 = obstack_copy0 (&cu->objfile->objfile_obstack,
14617 strlen (actual_class_name));
14618 xfree (actual_class_name);
14625 /* Adjust PART_DIE before generating a symbol for it. This function
14626 may set the is_external flag or change the DIE's name. */
14629 fixup_partial_die (struct partial_die_info *part_die,
14630 struct dwarf2_cu *cu)
14632 /* Once we've fixed up a die, there's no point in doing so again.
14633 This also avoids a memory leak if we were to call
14634 guess_partial_die_structure_name multiple times. */
14635 if (part_die->fixup_called)
14638 /* If we found a reference attribute and the DIE has no name, try
14639 to find a name in the referred to DIE. */
14641 if (part_die->name == NULL && part_die->has_specification)
14643 struct partial_die_info *spec_die;
14645 spec_die = find_partial_die (part_die->spec_offset,
14646 part_die->spec_is_dwz, cu);
14648 fixup_partial_die (spec_die, cu);
14650 if (spec_die->name)
14652 part_die->name = spec_die->name;
14654 /* Copy DW_AT_external attribute if it is set. */
14655 if (spec_die->is_external)
14656 part_die->is_external = spec_die->is_external;
14660 /* Set default names for some unnamed DIEs. */
14662 if (part_die->name == NULL && part_die->tag == DW_TAG_namespace)
14663 part_die->name = CP_ANONYMOUS_NAMESPACE_STR;
14665 /* If there is no parent die to provide a namespace, and there are
14666 children, see if we can determine the namespace from their linkage
14668 if (cu->language == language_cplus
14669 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
14670 && part_die->die_parent == NULL
14671 && part_die->has_children
14672 && (part_die->tag == DW_TAG_class_type
14673 || part_die->tag == DW_TAG_structure_type
14674 || part_die->tag == DW_TAG_union_type))
14675 guess_partial_die_structure_name (part_die, cu);
14677 /* GCC might emit a nameless struct or union that has a linkage
14678 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
14679 if (part_die->name == NULL
14680 && (part_die->tag == DW_TAG_class_type
14681 || part_die->tag == DW_TAG_interface_type
14682 || part_die->tag == DW_TAG_structure_type
14683 || part_die->tag == DW_TAG_union_type)
14684 && part_die->linkage_name != NULL)
14688 demangled = gdb_demangle (part_die->linkage_name, DMGL_TYPES);
14693 /* Strip any leading namespaces/classes, keep only the base name.
14694 DW_AT_name for named DIEs does not contain the prefixes. */
14695 base = strrchr (demangled, ':');
14696 if (base && base > demangled && base[-1] == ':')
14701 part_die->name = obstack_copy0 (&cu->objfile->objfile_obstack,
14702 base, strlen (base));
14707 part_die->fixup_called = 1;
14710 /* Read an attribute value described by an attribute form. */
14712 static const gdb_byte *
14713 read_attribute_value (const struct die_reader_specs *reader,
14714 struct attribute *attr, unsigned form,
14715 const gdb_byte *info_ptr)
14717 struct dwarf2_cu *cu = reader->cu;
14718 bfd *abfd = reader->abfd;
14719 struct comp_unit_head *cu_header = &cu->header;
14720 unsigned int bytes_read;
14721 struct dwarf_block *blk;
14726 case DW_FORM_ref_addr:
14727 if (cu->header.version == 2)
14728 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
14730 DW_UNSND (attr) = read_offset (abfd, info_ptr,
14731 &cu->header, &bytes_read);
14732 info_ptr += bytes_read;
14734 case DW_FORM_GNU_ref_alt:
14735 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
14736 info_ptr += bytes_read;
14739 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
14740 info_ptr += bytes_read;
14742 case DW_FORM_block2:
14743 blk = dwarf_alloc_block (cu);
14744 blk->size = read_2_bytes (abfd, info_ptr);
14746 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14747 info_ptr += blk->size;
14748 DW_BLOCK (attr) = blk;
14750 case DW_FORM_block4:
14751 blk = dwarf_alloc_block (cu);
14752 blk->size = read_4_bytes (abfd, info_ptr);
14754 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14755 info_ptr += blk->size;
14756 DW_BLOCK (attr) = blk;
14758 case DW_FORM_data2:
14759 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
14762 case DW_FORM_data4:
14763 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
14766 case DW_FORM_data8:
14767 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
14770 case DW_FORM_sec_offset:
14771 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
14772 info_ptr += bytes_read;
14774 case DW_FORM_string:
14775 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
14776 DW_STRING_IS_CANONICAL (attr) = 0;
14777 info_ptr += bytes_read;
14780 if (!cu->per_cu->is_dwz)
14782 DW_STRING (attr) = read_indirect_string (abfd, info_ptr, cu_header,
14784 DW_STRING_IS_CANONICAL (attr) = 0;
14785 info_ptr += bytes_read;
14789 case DW_FORM_GNU_strp_alt:
14791 struct dwz_file *dwz = dwarf2_get_dwz_file ();
14792 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
14795 DW_STRING (attr) = read_indirect_string_from_dwz (dwz, str_offset);
14796 DW_STRING_IS_CANONICAL (attr) = 0;
14797 info_ptr += bytes_read;
14800 case DW_FORM_exprloc:
14801 case DW_FORM_block:
14802 blk = dwarf_alloc_block (cu);
14803 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14804 info_ptr += bytes_read;
14805 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14806 info_ptr += blk->size;
14807 DW_BLOCK (attr) = blk;
14809 case DW_FORM_block1:
14810 blk = dwarf_alloc_block (cu);
14811 blk->size = read_1_byte (abfd, info_ptr);
14813 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
14814 info_ptr += blk->size;
14815 DW_BLOCK (attr) = blk;
14817 case DW_FORM_data1:
14818 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
14822 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
14825 case DW_FORM_flag_present:
14826 DW_UNSND (attr) = 1;
14828 case DW_FORM_sdata:
14829 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
14830 info_ptr += bytes_read;
14832 case DW_FORM_udata:
14833 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14834 info_ptr += bytes_read;
14837 DW_UNSND (attr) = (cu->header.offset.sect_off
14838 + read_1_byte (abfd, info_ptr));
14842 DW_UNSND (attr) = (cu->header.offset.sect_off
14843 + read_2_bytes (abfd, info_ptr));
14847 DW_UNSND (attr) = (cu->header.offset.sect_off
14848 + read_4_bytes (abfd, info_ptr));
14852 DW_UNSND (attr) = (cu->header.offset.sect_off
14853 + read_8_bytes (abfd, info_ptr));
14856 case DW_FORM_ref_sig8:
14857 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
14860 case DW_FORM_ref_udata:
14861 DW_UNSND (attr) = (cu->header.offset.sect_off
14862 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
14863 info_ptr += bytes_read;
14865 case DW_FORM_indirect:
14866 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14867 info_ptr += bytes_read;
14868 info_ptr = read_attribute_value (reader, attr, form, info_ptr);
14870 case DW_FORM_GNU_addr_index:
14871 if (reader->dwo_file == NULL)
14873 /* For now flag a hard error.
14874 Later we can turn this into a complaint. */
14875 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
14876 dwarf_form_name (form),
14877 bfd_get_filename (abfd));
14879 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
14880 info_ptr += bytes_read;
14882 case DW_FORM_GNU_str_index:
14883 if (reader->dwo_file == NULL)
14885 /* For now flag a hard error.
14886 Later we can turn this into a complaint if warranted. */
14887 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
14888 dwarf_form_name (form),
14889 bfd_get_filename (abfd));
14892 ULONGEST str_index =
14893 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
14895 DW_STRING (attr) = read_str_index (reader, cu, str_index);
14896 DW_STRING_IS_CANONICAL (attr) = 0;
14897 info_ptr += bytes_read;
14901 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
14902 dwarf_form_name (form),
14903 bfd_get_filename (abfd));
14907 if (cu->per_cu->is_dwz && attr_form_is_ref (attr))
14908 attr->form = DW_FORM_GNU_ref_alt;
14910 /* We have seen instances where the compiler tried to emit a byte
14911 size attribute of -1 which ended up being encoded as an unsigned
14912 0xffffffff. Although 0xffffffff is technically a valid size value,
14913 an object of this size seems pretty unlikely so we can relatively
14914 safely treat these cases as if the size attribute was invalid and
14915 treat them as zero by default. */
14916 if (attr->name == DW_AT_byte_size
14917 && form == DW_FORM_data4
14918 && DW_UNSND (attr) >= 0xffffffff)
14921 (&symfile_complaints,
14922 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
14923 hex_string (DW_UNSND (attr)));
14924 DW_UNSND (attr) = 0;
14930 /* Read an attribute described by an abbreviated attribute. */
14932 static const gdb_byte *
14933 read_attribute (const struct die_reader_specs *reader,
14934 struct attribute *attr, struct attr_abbrev *abbrev,
14935 const gdb_byte *info_ptr)
14937 attr->name = abbrev->name;
14938 return read_attribute_value (reader, attr, abbrev->form, info_ptr);
14941 /* Read dwarf information from a buffer. */
14943 static unsigned int
14944 read_1_byte (bfd *abfd, const gdb_byte *buf)
14946 return bfd_get_8 (abfd, buf);
14950 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
14952 return bfd_get_signed_8 (abfd, buf);
14955 static unsigned int
14956 read_2_bytes (bfd *abfd, const gdb_byte *buf)
14958 return bfd_get_16 (abfd, buf);
14962 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
14964 return bfd_get_signed_16 (abfd, buf);
14967 static unsigned int
14968 read_4_bytes (bfd *abfd, const gdb_byte *buf)
14970 return bfd_get_32 (abfd, buf);
14974 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
14976 return bfd_get_signed_32 (abfd, buf);
14980 read_8_bytes (bfd *abfd, const gdb_byte *buf)
14982 return bfd_get_64 (abfd, buf);
14986 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
14987 unsigned int *bytes_read)
14989 struct comp_unit_head *cu_header = &cu->header;
14990 CORE_ADDR retval = 0;
14992 if (cu_header->signed_addr_p)
14994 switch (cu_header->addr_size)
14997 retval = bfd_get_signed_16 (abfd, buf);
15000 retval = bfd_get_signed_32 (abfd, buf);
15003 retval = bfd_get_signed_64 (abfd, buf);
15006 internal_error (__FILE__, __LINE__,
15007 _("read_address: bad switch, signed [in module %s]"),
15008 bfd_get_filename (abfd));
15013 switch (cu_header->addr_size)
15016 retval = bfd_get_16 (abfd, buf);
15019 retval = bfd_get_32 (abfd, buf);
15022 retval = bfd_get_64 (abfd, buf);
15025 internal_error (__FILE__, __LINE__,
15026 _("read_address: bad switch, "
15027 "unsigned [in module %s]"),
15028 bfd_get_filename (abfd));
15032 *bytes_read = cu_header->addr_size;
15036 /* Read the initial length from a section. The (draft) DWARF 3
15037 specification allows the initial length to take up either 4 bytes
15038 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
15039 bytes describe the length and all offsets will be 8 bytes in length
15042 An older, non-standard 64-bit format is also handled by this
15043 function. The older format in question stores the initial length
15044 as an 8-byte quantity without an escape value. Lengths greater
15045 than 2^32 aren't very common which means that the initial 4 bytes
15046 is almost always zero. Since a length value of zero doesn't make
15047 sense for the 32-bit format, this initial zero can be considered to
15048 be an escape value which indicates the presence of the older 64-bit
15049 format. As written, the code can't detect (old format) lengths
15050 greater than 4GB. If it becomes necessary to handle lengths
15051 somewhat larger than 4GB, we could allow other small values (such
15052 as the non-sensical values of 1, 2, and 3) to also be used as
15053 escape values indicating the presence of the old format.
15055 The value returned via bytes_read should be used to increment the
15056 relevant pointer after calling read_initial_length().
15058 [ Note: read_initial_length() and read_offset() are based on the
15059 document entitled "DWARF Debugging Information Format", revision
15060 3, draft 8, dated November 19, 2001. This document was obtained
15063 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
15065 This document is only a draft and is subject to change. (So beware.)
15067 Details regarding the older, non-standard 64-bit format were
15068 determined empirically by examining 64-bit ELF files produced by
15069 the SGI toolchain on an IRIX 6.5 machine.
15071 - Kevin, July 16, 2002
15075 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
15077 LONGEST length = bfd_get_32 (abfd, buf);
15079 if (length == 0xffffffff)
15081 length = bfd_get_64 (abfd, buf + 4);
15084 else if (length == 0)
15086 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
15087 length = bfd_get_64 (abfd, buf);
15098 /* Cover function for read_initial_length.
15099 Returns the length of the object at BUF, and stores the size of the
15100 initial length in *BYTES_READ and stores the size that offsets will be in
15102 If the initial length size is not equivalent to that specified in
15103 CU_HEADER then issue a complaint.
15104 This is useful when reading non-comp-unit headers. */
15107 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
15108 const struct comp_unit_head *cu_header,
15109 unsigned int *bytes_read,
15110 unsigned int *offset_size)
15112 LONGEST length = read_initial_length (abfd, buf, bytes_read);
15114 gdb_assert (cu_header->initial_length_size == 4
15115 || cu_header->initial_length_size == 8
15116 || cu_header->initial_length_size == 12);
15118 if (cu_header->initial_length_size != *bytes_read)
15119 complaint (&symfile_complaints,
15120 _("intermixed 32-bit and 64-bit DWARF sections"));
15122 *offset_size = (*bytes_read == 4) ? 4 : 8;
15126 /* Read an offset from the data stream. The size of the offset is
15127 given by cu_header->offset_size. */
15130 read_offset (bfd *abfd, const gdb_byte *buf,
15131 const struct comp_unit_head *cu_header,
15132 unsigned int *bytes_read)
15134 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
15136 *bytes_read = cu_header->offset_size;
15140 /* Read an offset from the data stream. */
15143 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
15145 LONGEST retval = 0;
15147 switch (offset_size)
15150 retval = bfd_get_32 (abfd, buf);
15153 retval = bfd_get_64 (abfd, buf);
15156 internal_error (__FILE__, __LINE__,
15157 _("read_offset_1: bad switch [in module %s]"),
15158 bfd_get_filename (abfd));
15164 static const gdb_byte *
15165 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
15167 /* If the size of a host char is 8 bits, we can return a pointer
15168 to the buffer, otherwise we have to copy the data to a buffer
15169 allocated on the temporary obstack. */
15170 gdb_assert (HOST_CHAR_BIT == 8);
15174 static const char *
15175 read_direct_string (bfd *abfd, const gdb_byte *buf,
15176 unsigned int *bytes_read_ptr)
15178 /* If the size of a host char is 8 bits, we can return a pointer
15179 to the string, otherwise we have to copy the string to a buffer
15180 allocated on the temporary obstack. */
15181 gdb_assert (HOST_CHAR_BIT == 8);
15184 *bytes_read_ptr = 1;
15187 *bytes_read_ptr = strlen ((const char *) buf) + 1;
15188 return (const char *) buf;
15191 static const char *
15192 read_indirect_string_at_offset (bfd *abfd, LONGEST str_offset)
15194 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwarf2_per_objfile->str);
15195 if (dwarf2_per_objfile->str.buffer == NULL)
15196 error (_("DW_FORM_strp used without .debug_str section [in module %s]"),
15197 bfd_get_filename (abfd));
15198 if (str_offset >= dwarf2_per_objfile->str.size)
15199 error (_("DW_FORM_strp pointing outside of "
15200 ".debug_str section [in module %s]"),
15201 bfd_get_filename (abfd));
15202 gdb_assert (HOST_CHAR_BIT == 8);
15203 if (dwarf2_per_objfile->str.buffer[str_offset] == '\0')
15205 return (const char *) (dwarf2_per_objfile->str.buffer + str_offset);
15208 /* Read a string at offset STR_OFFSET in the .debug_str section from
15209 the .dwz file DWZ. Throw an error if the offset is too large. If
15210 the string consists of a single NUL byte, return NULL; otherwise
15211 return a pointer to the string. */
15213 static const char *
15214 read_indirect_string_from_dwz (struct dwz_file *dwz, LONGEST str_offset)
15216 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwz->str);
15218 if (dwz->str.buffer == NULL)
15219 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
15220 "section [in module %s]"),
15221 bfd_get_filename (dwz->dwz_bfd));
15222 if (str_offset >= dwz->str.size)
15223 error (_("DW_FORM_GNU_strp_alt pointing outside of "
15224 ".debug_str section [in module %s]"),
15225 bfd_get_filename (dwz->dwz_bfd));
15226 gdb_assert (HOST_CHAR_BIT == 8);
15227 if (dwz->str.buffer[str_offset] == '\0')
15229 return (const char *) (dwz->str.buffer + str_offset);
15232 static const char *
15233 read_indirect_string (bfd *abfd, const gdb_byte *buf,
15234 const struct comp_unit_head *cu_header,
15235 unsigned int *bytes_read_ptr)
15237 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
15239 return read_indirect_string_at_offset (abfd, str_offset);
15243 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
15244 unsigned int *bytes_read_ptr)
15247 unsigned int num_read;
15249 unsigned char byte;
15257 byte = bfd_get_8 (abfd, buf);
15260 result |= ((ULONGEST) (byte & 127) << shift);
15261 if ((byte & 128) == 0)
15267 *bytes_read_ptr = num_read;
15272 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
15273 unsigned int *bytes_read_ptr)
15276 int i, shift, num_read;
15277 unsigned char byte;
15285 byte = bfd_get_8 (abfd, buf);
15288 result |= ((LONGEST) (byte & 127) << shift);
15290 if ((byte & 128) == 0)
15295 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
15296 result |= -(((LONGEST) 1) << shift);
15297 *bytes_read_ptr = num_read;
15301 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
15302 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
15303 ADDR_SIZE is the size of addresses from the CU header. */
15306 read_addr_index_1 (unsigned int addr_index, ULONGEST addr_base, int addr_size)
15308 struct objfile *objfile = dwarf2_per_objfile->objfile;
15309 bfd *abfd = objfile->obfd;
15310 const gdb_byte *info_ptr;
15312 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
15313 if (dwarf2_per_objfile->addr.buffer == NULL)
15314 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
15315 objfile_name (objfile));
15316 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
15317 error (_("DW_FORM_addr_index pointing outside of "
15318 ".debug_addr section [in module %s]"),
15319 objfile_name (objfile));
15320 info_ptr = (dwarf2_per_objfile->addr.buffer
15321 + addr_base + addr_index * addr_size);
15322 if (addr_size == 4)
15323 return bfd_get_32 (abfd, info_ptr);
15325 return bfd_get_64 (abfd, info_ptr);
15328 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
15331 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
15333 return read_addr_index_1 (addr_index, cu->addr_base, cu->header.addr_size);
15336 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
15339 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
15340 unsigned int *bytes_read)
15342 bfd *abfd = cu->objfile->obfd;
15343 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
15345 return read_addr_index (cu, addr_index);
15348 /* Data structure to pass results from dwarf2_read_addr_index_reader
15349 back to dwarf2_read_addr_index. */
15351 struct dwarf2_read_addr_index_data
15353 ULONGEST addr_base;
15357 /* die_reader_func for dwarf2_read_addr_index. */
15360 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
15361 const gdb_byte *info_ptr,
15362 struct die_info *comp_unit_die,
15366 struct dwarf2_cu *cu = reader->cu;
15367 struct dwarf2_read_addr_index_data *aidata =
15368 (struct dwarf2_read_addr_index_data *) data;
15370 aidata->addr_base = cu->addr_base;
15371 aidata->addr_size = cu->header.addr_size;
15374 /* Given an index in .debug_addr, fetch the value.
15375 NOTE: This can be called during dwarf expression evaluation,
15376 long after the debug information has been read, and thus per_cu->cu
15377 may no longer exist. */
15380 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
15381 unsigned int addr_index)
15383 struct objfile *objfile = per_cu->objfile;
15384 struct dwarf2_cu *cu = per_cu->cu;
15385 ULONGEST addr_base;
15388 /* This is intended to be called from outside this file. */
15389 dw2_setup (objfile);
15391 /* We need addr_base and addr_size.
15392 If we don't have PER_CU->cu, we have to get it.
15393 Nasty, but the alternative is storing the needed info in PER_CU,
15394 which at this point doesn't seem justified: it's not clear how frequently
15395 it would get used and it would increase the size of every PER_CU.
15396 Entry points like dwarf2_per_cu_addr_size do a similar thing
15397 so we're not in uncharted territory here.
15398 Alas we need to be a bit more complicated as addr_base is contained
15401 We don't need to read the entire CU(/TU).
15402 We just need the header and top level die.
15404 IWBN to use the aging mechanism to let us lazily later discard the CU.
15405 For now we skip this optimization. */
15409 addr_base = cu->addr_base;
15410 addr_size = cu->header.addr_size;
15414 struct dwarf2_read_addr_index_data aidata;
15416 /* Note: We can't use init_cutu_and_read_dies_simple here,
15417 we need addr_base. */
15418 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
15419 dwarf2_read_addr_index_reader, &aidata);
15420 addr_base = aidata.addr_base;
15421 addr_size = aidata.addr_size;
15424 return read_addr_index_1 (addr_index, addr_base, addr_size);
15427 /* Given a DW_AT_str_index, fetch the string. */
15429 static const char *
15430 read_str_index (const struct die_reader_specs *reader,
15431 struct dwarf2_cu *cu, ULONGEST str_index)
15433 struct objfile *objfile = dwarf2_per_objfile->objfile;
15434 const char *dwo_name = objfile_name (objfile);
15435 bfd *abfd = objfile->obfd;
15436 struct dwo_sections *sections = &reader->dwo_file->sections;
15437 const gdb_byte *info_ptr;
15438 ULONGEST str_offset;
15440 dwarf2_read_section (objfile, §ions->str);
15441 dwarf2_read_section (objfile, §ions->str_offsets);
15442 if (sections->str.buffer == NULL)
15443 error (_("DW_FORM_str_index used without .debug_str.dwo section"
15444 " in CU at offset 0x%lx [in module %s]"),
15445 (long) cu->header.offset.sect_off, dwo_name);
15446 if (sections->str_offsets.buffer == NULL)
15447 error (_("DW_FORM_str_index used without .debug_str_offsets.dwo section"
15448 " in CU at offset 0x%lx [in module %s]"),
15449 (long) cu->header.offset.sect_off, dwo_name);
15450 if (str_index * cu->header.offset_size >= sections->str_offsets.size)
15451 error (_("DW_FORM_str_index pointing outside of .debug_str_offsets.dwo"
15452 " section in CU at offset 0x%lx [in module %s]"),
15453 (long) cu->header.offset.sect_off, dwo_name);
15454 info_ptr = (sections->str_offsets.buffer
15455 + str_index * cu->header.offset_size);
15456 if (cu->header.offset_size == 4)
15457 str_offset = bfd_get_32 (abfd, info_ptr);
15459 str_offset = bfd_get_64 (abfd, info_ptr);
15460 if (str_offset >= sections->str.size)
15461 error (_("Offset from DW_FORM_str_index pointing outside of"
15462 " .debug_str.dwo section in CU at offset 0x%lx [in module %s]"),
15463 (long) cu->header.offset.sect_off, dwo_name);
15464 return (const char *) (sections->str.buffer + str_offset);
15467 /* Return the length of an LEB128 number in BUF. */
15470 leb128_size (const gdb_byte *buf)
15472 const gdb_byte *begin = buf;
15478 if ((byte & 128) == 0)
15479 return buf - begin;
15484 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
15492 cu->language = language_c;
15494 case DW_LANG_C_plus_plus:
15495 cu->language = language_cplus;
15498 cu->language = language_d;
15500 case DW_LANG_Fortran77:
15501 case DW_LANG_Fortran90:
15502 case DW_LANG_Fortran95:
15503 cu->language = language_fortran;
15506 cu->language = language_go;
15508 case DW_LANG_Mips_Assembler:
15509 cu->language = language_asm;
15512 cu->language = language_java;
15514 case DW_LANG_Ada83:
15515 case DW_LANG_Ada95:
15516 cu->language = language_ada;
15518 case DW_LANG_Modula2:
15519 cu->language = language_m2;
15521 case DW_LANG_Pascal83:
15522 cu->language = language_pascal;
15525 cu->language = language_objc;
15527 case DW_LANG_Cobol74:
15528 case DW_LANG_Cobol85:
15530 cu->language = language_minimal;
15533 cu->language_defn = language_def (cu->language);
15536 /* Return the named attribute or NULL if not there. */
15538 static struct attribute *
15539 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
15544 struct attribute *spec = NULL;
15546 for (i = 0; i < die->num_attrs; ++i)
15548 if (die->attrs[i].name == name)
15549 return &die->attrs[i];
15550 if (die->attrs[i].name == DW_AT_specification
15551 || die->attrs[i].name == DW_AT_abstract_origin)
15552 spec = &die->attrs[i];
15558 die = follow_die_ref (die, spec, &cu);
15564 /* Return the named attribute or NULL if not there,
15565 but do not follow DW_AT_specification, etc.
15566 This is for use in contexts where we're reading .debug_types dies.
15567 Following DW_AT_specification, DW_AT_abstract_origin will take us
15568 back up the chain, and we want to go down. */
15570 static struct attribute *
15571 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
15575 for (i = 0; i < die->num_attrs; ++i)
15576 if (die->attrs[i].name == name)
15577 return &die->attrs[i];
15582 /* Return non-zero iff the attribute NAME is defined for the given DIE,
15583 and holds a non-zero value. This function should only be used for
15584 DW_FORM_flag or DW_FORM_flag_present attributes. */
15587 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
15589 struct attribute *attr = dwarf2_attr (die, name, cu);
15591 return (attr && DW_UNSND (attr));
15595 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
15597 /* A DIE is a declaration if it has a DW_AT_declaration attribute
15598 which value is non-zero. However, we have to be careful with
15599 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
15600 (via dwarf2_flag_true_p) follows this attribute. So we may
15601 end up accidently finding a declaration attribute that belongs
15602 to a different DIE referenced by the specification attribute,
15603 even though the given DIE does not have a declaration attribute. */
15604 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
15605 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
15608 /* Return the die giving the specification for DIE, if there is
15609 one. *SPEC_CU is the CU containing DIE on input, and the CU
15610 containing the return value on output. If there is no
15611 specification, but there is an abstract origin, that is
15614 static struct die_info *
15615 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
15617 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
15620 if (spec_attr == NULL)
15621 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
15623 if (spec_attr == NULL)
15626 return follow_die_ref (die, spec_attr, spec_cu);
15629 /* Free the line_header structure *LH, and any arrays and strings it
15631 NOTE: This is also used as a "cleanup" function. */
15634 free_line_header (struct line_header *lh)
15636 if (lh->standard_opcode_lengths)
15637 xfree (lh->standard_opcode_lengths);
15639 /* Remember that all the lh->file_names[i].name pointers are
15640 pointers into debug_line_buffer, and don't need to be freed. */
15641 if (lh->file_names)
15642 xfree (lh->file_names);
15644 /* Similarly for the include directory names. */
15645 if (lh->include_dirs)
15646 xfree (lh->include_dirs);
15651 /* Add an entry to LH's include directory table. */
15654 add_include_dir (struct line_header *lh, const char *include_dir)
15656 /* Grow the array if necessary. */
15657 if (lh->include_dirs_size == 0)
15659 lh->include_dirs_size = 1; /* for testing */
15660 lh->include_dirs = xmalloc (lh->include_dirs_size
15661 * sizeof (*lh->include_dirs));
15663 else if (lh->num_include_dirs >= lh->include_dirs_size)
15665 lh->include_dirs_size *= 2;
15666 lh->include_dirs = xrealloc (lh->include_dirs,
15667 (lh->include_dirs_size
15668 * sizeof (*lh->include_dirs)));
15671 lh->include_dirs[lh->num_include_dirs++] = include_dir;
15674 /* Add an entry to LH's file name table. */
15677 add_file_name (struct line_header *lh,
15679 unsigned int dir_index,
15680 unsigned int mod_time,
15681 unsigned int length)
15683 struct file_entry *fe;
15685 /* Grow the array if necessary. */
15686 if (lh->file_names_size == 0)
15688 lh->file_names_size = 1; /* for testing */
15689 lh->file_names = xmalloc (lh->file_names_size
15690 * sizeof (*lh->file_names));
15692 else if (lh->num_file_names >= lh->file_names_size)
15694 lh->file_names_size *= 2;
15695 lh->file_names = xrealloc (lh->file_names,
15696 (lh->file_names_size
15697 * sizeof (*lh->file_names)));
15700 fe = &lh->file_names[lh->num_file_names++];
15702 fe->dir_index = dir_index;
15703 fe->mod_time = mod_time;
15704 fe->length = length;
15705 fe->included_p = 0;
15709 /* A convenience function to find the proper .debug_line section for a
15712 static struct dwarf2_section_info *
15713 get_debug_line_section (struct dwarf2_cu *cu)
15715 struct dwarf2_section_info *section;
15717 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
15719 if (cu->dwo_unit && cu->per_cu->is_debug_types)
15720 section = &cu->dwo_unit->dwo_file->sections.line;
15721 else if (cu->per_cu->is_dwz)
15723 struct dwz_file *dwz = dwarf2_get_dwz_file ();
15725 section = &dwz->line;
15728 section = &dwarf2_per_objfile->line;
15733 /* Read the statement program header starting at OFFSET in
15734 .debug_line, or .debug_line.dwo. Return a pointer
15735 to a struct line_header, allocated using xmalloc.
15737 NOTE: the strings in the include directory and file name tables of
15738 the returned object point into the dwarf line section buffer,
15739 and must not be freed. */
15741 static struct line_header *
15742 dwarf_decode_line_header (unsigned int offset, struct dwarf2_cu *cu)
15744 struct cleanup *back_to;
15745 struct line_header *lh;
15746 const gdb_byte *line_ptr;
15747 unsigned int bytes_read, offset_size;
15749 const char *cur_dir, *cur_file;
15750 struct dwarf2_section_info *section;
15753 section = get_debug_line_section (cu);
15754 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
15755 if (section->buffer == NULL)
15757 if (cu->dwo_unit && cu->per_cu->is_debug_types)
15758 complaint (&symfile_complaints, _("missing .debug_line.dwo section"));
15760 complaint (&symfile_complaints, _("missing .debug_line section"));
15764 /* We can't do this until we know the section is non-empty.
15765 Only then do we know we have such a section. */
15766 abfd = section->asection->owner;
15768 /* Make sure that at least there's room for the total_length field.
15769 That could be 12 bytes long, but we're just going to fudge that. */
15770 if (offset + 4 >= section->size)
15772 dwarf2_statement_list_fits_in_line_number_section_complaint ();
15776 lh = xmalloc (sizeof (*lh));
15777 memset (lh, 0, sizeof (*lh));
15778 back_to = make_cleanup ((make_cleanup_ftype *) free_line_header,
15781 line_ptr = section->buffer + offset;
15783 /* Read in the header. */
15785 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
15786 &bytes_read, &offset_size);
15787 line_ptr += bytes_read;
15788 if (line_ptr + lh->total_length > (section->buffer + section->size))
15790 dwarf2_statement_list_fits_in_line_number_section_complaint ();
15791 do_cleanups (back_to);
15794 lh->statement_program_end = line_ptr + lh->total_length;
15795 lh->version = read_2_bytes (abfd, line_ptr);
15797 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
15798 line_ptr += offset_size;
15799 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
15801 if (lh->version >= 4)
15803 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
15807 lh->maximum_ops_per_instruction = 1;
15809 if (lh->maximum_ops_per_instruction == 0)
15811 lh->maximum_ops_per_instruction = 1;
15812 complaint (&symfile_complaints,
15813 _("invalid maximum_ops_per_instruction "
15814 "in `.debug_line' section"));
15817 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
15819 lh->line_base = read_1_signed_byte (abfd, line_ptr);
15821 lh->line_range = read_1_byte (abfd, line_ptr);
15823 lh->opcode_base = read_1_byte (abfd, line_ptr);
15825 lh->standard_opcode_lengths
15826 = xmalloc (lh->opcode_base * sizeof (lh->standard_opcode_lengths[0]));
15828 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
15829 for (i = 1; i < lh->opcode_base; ++i)
15831 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
15835 /* Read directory table. */
15836 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
15838 line_ptr += bytes_read;
15839 add_include_dir (lh, cur_dir);
15841 line_ptr += bytes_read;
15843 /* Read file name table. */
15844 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
15846 unsigned int dir_index, mod_time, length;
15848 line_ptr += bytes_read;
15849 dir_index = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15850 line_ptr += bytes_read;
15851 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15852 line_ptr += bytes_read;
15853 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
15854 line_ptr += bytes_read;
15856 add_file_name (lh, cur_file, dir_index, mod_time, length);
15858 line_ptr += bytes_read;
15859 lh->statement_program_start = line_ptr;
15861 if (line_ptr > (section->buffer + section->size))
15862 complaint (&symfile_complaints,
15863 _("line number info header doesn't "
15864 "fit in `.debug_line' section"));
15866 discard_cleanups (back_to);
15870 /* Subroutine of dwarf_decode_lines to simplify it.
15871 Return the file name of the psymtab for included file FILE_INDEX
15872 in line header LH of PST.
15873 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
15874 If space for the result is malloc'd, it will be freed by a cleanup.
15875 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename.
15877 The function creates dangling cleanup registration. */
15879 static const char *
15880 psymtab_include_file_name (const struct line_header *lh, int file_index,
15881 const struct partial_symtab *pst,
15882 const char *comp_dir)
15884 const struct file_entry fe = lh->file_names [file_index];
15885 const char *include_name = fe.name;
15886 const char *include_name_to_compare = include_name;
15887 const char *dir_name = NULL;
15888 const char *pst_filename;
15889 char *copied_name = NULL;
15893 dir_name = lh->include_dirs[fe.dir_index - 1];
15895 if (!IS_ABSOLUTE_PATH (include_name)
15896 && (dir_name != NULL || comp_dir != NULL))
15898 /* Avoid creating a duplicate psymtab for PST.
15899 We do this by comparing INCLUDE_NAME and PST_FILENAME.
15900 Before we do the comparison, however, we need to account
15901 for DIR_NAME and COMP_DIR.
15902 First prepend dir_name (if non-NULL). If we still don't
15903 have an absolute path prepend comp_dir (if non-NULL).
15904 However, the directory we record in the include-file's
15905 psymtab does not contain COMP_DIR (to match the
15906 corresponding symtab(s)).
15911 bash$ gcc -g ./hello.c
15912 include_name = "hello.c"
15914 DW_AT_comp_dir = comp_dir = "/tmp"
15915 DW_AT_name = "./hello.c" */
15917 if (dir_name != NULL)
15919 char *tem = concat (dir_name, SLASH_STRING,
15920 include_name, (char *)NULL);
15922 make_cleanup (xfree, tem);
15923 include_name = tem;
15924 include_name_to_compare = include_name;
15926 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
15928 char *tem = concat (comp_dir, SLASH_STRING,
15929 include_name, (char *)NULL);
15931 make_cleanup (xfree, tem);
15932 include_name_to_compare = tem;
15936 pst_filename = pst->filename;
15937 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
15939 copied_name = concat (pst->dirname, SLASH_STRING,
15940 pst_filename, (char *)NULL);
15941 pst_filename = copied_name;
15944 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
15946 if (copied_name != NULL)
15947 xfree (copied_name);
15951 return include_name;
15954 /* Ignore this record_line request. */
15957 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
15962 /* Subroutine of dwarf_decode_lines to simplify it.
15963 Process the line number information in LH. */
15966 dwarf_decode_lines_1 (struct line_header *lh, const char *comp_dir,
15967 struct dwarf2_cu *cu, struct partial_symtab *pst)
15969 const gdb_byte *line_ptr, *extended_end;
15970 const gdb_byte *line_end;
15971 unsigned int bytes_read, extended_len;
15972 unsigned char op_code, extended_op, adj_opcode;
15973 CORE_ADDR baseaddr;
15974 struct objfile *objfile = cu->objfile;
15975 bfd *abfd = objfile->obfd;
15976 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15977 const int decode_for_pst_p = (pst != NULL);
15978 struct subfile *last_subfile = NULL;
15979 void (*p_record_line) (struct subfile *subfile, int line, CORE_ADDR pc)
15982 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
15984 line_ptr = lh->statement_program_start;
15985 line_end = lh->statement_program_end;
15987 /* Read the statement sequences until there's nothing left. */
15988 while (line_ptr < line_end)
15990 /* state machine registers */
15991 CORE_ADDR address = 0;
15992 unsigned int file = 1;
15993 unsigned int line = 1;
15994 unsigned int column = 0;
15995 int is_stmt = lh->default_is_stmt;
15996 int basic_block = 0;
15997 int end_sequence = 0;
15999 unsigned char op_index = 0;
16001 if (!decode_for_pst_p && lh->num_file_names >= file)
16003 /* Start a subfile for the current file of the state machine. */
16004 /* lh->include_dirs and lh->file_names are 0-based, but the
16005 directory and file name numbers in the statement program
16007 struct file_entry *fe = &lh->file_names[file - 1];
16008 const char *dir = NULL;
16011 dir = lh->include_dirs[fe->dir_index - 1];
16013 dwarf2_start_subfile (fe->name, dir, comp_dir);
16016 /* Decode the table. */
16017 while (!end_sequence)
16019 op_code = read_1_byte (abfd, line_ptr);
16021 if (line_ptr > line_end)
16023 dwarf2_debug_line_missing_end_sequence_complaint ();
16027 if (op_code >= lh->opcode_base)
16029 /* Special operand. */
16030 adj_opcode = op_code - lh->opcode_base;
16031 address += (((op_index + (adj_opcode / lh->line_range))
16032 / lh->maximum_ops_per_instruction)
16033 * lh->minimum_instruction_length);
16034 op_index = ((op_index + (adj_opcode / lh->line_range))
16035 % lh->maximum_ops_per_instruction);
16036 line += lh->line_base + (adj_opcode % lh->line_range);
16037 if (lh->num_file_names < file || file == 0)
16038 dwarf2_debug_line_missing_file_complaint ();
16039 /* For now we ignore lines not starting on an
16040 instruction boundary. */
16041 else if (op_index == 0)
16043 lh->file_names[file - 1].included_p = 1;
16044 if (!decode_for_pst_p && is_stmt)
16046 if (last_subfile != current_subfile)
16048 addr = gdbarch_addr_bits_remove (gdbarch, address);
16050 (*p_record_line) (last_subfile, 0, addr);
16051 last_subfile = current_subfile;
16053 /* Append row to matrix using current values. */
16054 addr = gdbarch_addr_bits_remove (gdbarch, address);
16055 (*p_record_line) (current_subfile, line, addr);
16060 else switch (op_code)
16062 case DW_LNS_extended_op:
16063 extended_len = read_unsigned_leb128 (abfd, line_ptr,
16065 line_ptr += bytes_read;
16066 extended_end = line_ptr + extended_len;
16067 extended_op = read_1_byte (abfd, line_ptr);
16069 switch (extended_op)
16071 case DW_LNE_end_sequence:
16072 p_record_line = record_line;
16075 case DW_LNE_set_address:
16076 address = read_address (abfd, line_ptr, cu, &bytes_read);
16078 if (address == 0 && !dwarf2_per_objfile->has_section_at_zero)
16080 /* This line table is for a function which has been
16081 GCd by the linker. Ignore it. PR gdb/12528 */
16084 = line_ptr - get_debug_line_section (cu)->buffer;
16086 complaint (&symfile_complaints,
16087 _(".debug_line address at offset 0x%lx is 0 "
16089 line_offset, objfile_name (objfile));
16090 p_record_line = noop_record_line;
16094 line_ptr += bytes_read;
16095 address += baseaddr;
16097 case DW_LNE_define_file:
16099 const char *cur_file;
16100 unsigned int dir_index, mod_time, length;
16102 cur_file = read_direct_string (abfd, line_ptr,
16104 line_ptr += bytes_read;
16106 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16107 line_ptr += bytes_read;
16109 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16110 line_ptr += bytes_read;
16112 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16113 line_ptr += bytes_read;
16114 add_file_name (lh, cur_file, dir_index, mod_time, length);
16117 case DW_LNE_set_discriminator:
16118 /* The discriminator is not interesting to the debugger;
16120 line_ptr = extended_end;
16123 complaint (&symfile_complaints,
16124 _("mangled .debug_line section"));
16127 /* Make sure that we parsed the extended op correctly. If e.g.
16128 we expected a different address size than the producer used,
16129 we may have read the wrong number of bytes. */
16130 if (line_ptr != extended_end)
16132 complaint (&symfile_complaints,
16133 _("mangled .debug_line section"));
16138 if (lh->num_file_names < file || file == 0)
16139 dwarf2_debug_line_missing_file_complaint ();
16142 lh->file_names[file - 1].included_p = 1;
16143 if (!decode_for_pst_p && is_stmt)
16145 if (last_subfile != current_subfile)
16147 addr = gdbarch_addr_bits_remove (gdbarch, address);
16149 (*p_record_line) (last_subfile, 0, addr);
16150 last_subfile = current_subfile;
16152 addr = gdbarch_addr_bits_remove (gdbarch, address);
16153 (*p_record_line) (current_subfile, line, addr);
16158 case DW_LNS_advance_pc:
16161 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16163 address += (((op_index + adjust)
16164 / lh->maximum_ops_per_instruction)
16165 * lh->minimum_instruction_length);
16166 op_index = ((op_index + adjust)
16167 % lh->maximum_ops_per_instruction);
16168 line_ptr += bytes_read;
16171 case DW_LNS_advance_line:
16172 line += read_signed_leb128 (abfd, line_ptr, &bytes_read);
16173 line_ptr += bytes_read;
16175 case DW_LNS_set_file:
16177 /* The arrays lh->include_dirs and lh->file_names are
16178 0-based, but the directory and file name numbers in
16179 the statement program are 1-based. */
16180 struct file_entry *fe;
16181 const char *dir = NULL;
16183 file = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16184 line_ptr += bytes_read;
16185 if (lh->num_file_names < file || file == 0)
16186 dwarf2_debug_line_missing_file_complaint ();
16189 fe = &lh->file_names[file - 1];
16191 dir = lh->include_dirs[fe->dir_index - 1];
16192 if (!decode_for_pst_p)
16194 last_subfile = current_subfile;
16195 dwarf2_start_subfile (fe->name, dir, comp_dir);
16200 case DW_LNS_set_column:
16201 column = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16202 line_ptr += bytes_read;
16204 case DW_LNS_negate_stmt:
16205 is_stmt = (!is_stmt);
16207 case DW_LNS_set_basic_block:
16210 /* Add to the address register of the state machine the
16211 address increment value corresponding to special opcode
16212 255. I.e., this value is scaled by the minimum
16213 instruction length since special opcode 255 would have
16214 scaled the increment. */
16215 case DW_LNS_const_add_pc:
16217 CORE_ADDR adjust = (255 - lh->opcode_base) / lh->line_range;
16219 address += (((op_index + adjust)
16220 / lh->maximum_ops_per_instruction)
16221 * lh->minimum_instruction_length);
16222 op_index = ((op_index + adjust)
16223 % lh->maximum_ops_per_instruction);
16226 case DW_LNS_fixed_advance_pc:
16227 address += read_2_bytes (abfd, line_ptr);
16233 /* Unknown standard opcode, ignore it. */
16236 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
16238 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
16239 line_ptr += bytes_read;
16244 if (lh->num_file_names < file || file == 0)
16245 dwarf2_debug_line_missing_file_complaint ();
16248 lh->file_names[file - 1].included_p = 1;
16249 if (!decode_for_pst_p)
16251 addr = gdbarch_addr_bits_remove (gdbarch, address);
16252 (*p_record_line) (current_subfile, 0, addr);
16258 /* Decode the Line Number Program (LNP) for the given line_header
16259 structure and CU. The actual information extracted and the type
16260 of structures created from the LNP depends on the value of PST.
16262 1. If PST is NULL, then this procedure uses the data from the program
16263 to create all necessary symbol tables, and their linetables.
16265 2. If PST is not NULL, this procedure reads the program to determine
16266 the list of files included by the unit represented by PST, and
16267 builds all the associated partial symbol tables.
16269 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
16270 It is used for relative paths in the line table.
16271 NOTE: When processing partial symtabs (pst != NULL),
16272 comp_dir == pst->dirname.
16274 NOTE: It is important that psymtabs have the same file name (via strcmp)
16275 as the corresponding symtab. Since COMP_DIR is not used in the name of the
16276 symtab we don't use it in the name of the psymtabs we create.
16277 E.g. expand_line_sal requires this when finding psymtabs to expand.
16278 A good testcase for this is mb-inline.exp. */
16281 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
16282 struct dwarf2_cu *cu, struct partial_symtab *pst,
16283 int want_line_info)
16285 struct objfile *objfile = cu->objfile;
16286 const int decode_for_pst_p = (pst != NULL);
16287 struct subfile *first_subfile = current_subfile;
16289 if (want_line_info)
16290 dwarf_decode_lines_1 (lh, comp_dir, cu, pst);
16292 if (decode_for_pst_p)
16296 /* Now that we're done scanning the Line Header Program, we can
16297 create the psymtab of each included file. */
16298 for (file_index = 0; file_index < lh->num_file_names; file_index++)
16299 if (lh->file_names[file_index].included_p == 1)
16301 const char *include_name =
16302 psymtab_include_file_name (lh, file_index, pst, comp_dir);
16303 if (include_name != NULL)
16304 dwarf2_create_include_psymtab (include_name, pst, objfile);
16309 /* Make sure a symtab is created for every file, even files
16310 which contain only variables (i.e. no code with associated
16314 for (i = 0; i < lh->num_file_names; i++)
16316 const char *dir = NULL;
16317 struct file_entry *fe;
16319 fe = &lh->file_names[i];
16321 dir = lh->include_dirs[fe->dir_index - 1];
16322 dwarf2_start_subfile (fe->name, dir, comp_dir);
16324 /* Skip the main file; we don't need it, and it must be
16325 allocated last, so that it will show up before the
16326 non-primary symtabs in the objfile's symtab list. */
16327 if (current_subfile == first_subfile)
16330 if (current_subfile->symtab == NULL)
16331 current_subfile->symtab = allocate_symtab (current_subfile->name,
16333 fe->symtab = current_subfile->symtab;
16338 /* Start a subfile for DWARF. FILENAME is the name of the file and
16339 DIRNAME the name of the source directory which contains FILENAME
16340 or NULL if not known. COMP_DIR is the compilation directory for the
16341 linetable's compilation unit or NULL if not known.
16342 This routine tries to keep line numbers from identical absolute and
16343 relative file names in a common subfile.
16345 Using the `list' example from the GDB testsuite, which resides in
16346 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
16347 of /srcdir/list0.c yields the following debugging information for list0.c:
16349 DW_AT_name: /srcdir/list0.c
16350 DW_AT_comp_dir: /compdir
16351 files.files[0].name: list0.h
16352 files.files[0].dir: /srcdir
16353 files.files[1].name: list0.c
16354 files.files[1].dir: /srcdir
16356 The line number information for list0.c has to end up in a single
16357 subfile, so that `break /srcdir/list0.c:1' works as expected.
16358 start_subfile will ensure that this happens provided that we pass the
16359 concatenation of files.files[1].dir and files.files[1].name as the
16363 dwarf2_start_subfile (const char *filename, const char *dirname,
16364 const char *comp_dir)
16368 /* While reading the DIEs, we call start_symtab(DW_AT_name, DW_AT_comp_dir).
16369 `start_symtab' will always pass the contents of DW_AT_comp_dir as
16370 second argument to start_subfile. To be consistent, we do the
16371 same here. In order not to lose the line information directory,
16372 we concatenate it to the filename when it makes sense.
16373 Note that the Dwarf3 standard says (speaking of filenames in line
16374 information): ``The directory index is ignored for file names
16375 that represent full path names''. Thus ignoring dirname in the
16376 `else' branch below isn't an issue. */
16378 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
16380 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
16384 start_subfile (filename, comp_dir);
16390 /* Start a symtab for DWARF.
16391 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */
16394 dwarf2_start_symtab (struct dwarf2_cu *cu,
16395 const char *name, const char *comp_dir, CORE_ADDR low_pc)
16397 start_symtab (name, comp_dir, low_pc);
16398 record_debugformat ("DWARF 2");
16399 record_producer (cu->producer);
16401 /* We assume that we're processing GCC output. */
16402 processing_gcc_compilation = 2;
16404 cu->processing_has_namespace_info = 0;
16408 var_decode_location (struct attribute *attr, struct symbol *sym,
16409 struct dwarf2_cu *cu)
16411 struct objfile *objfile = cu->objfile;
16412 struct comp_unit_head *cu_header = &cu->header;
16414 /* NOTE drow/2003-01-30: There used to be a comment and some special
16415 code here to turn a symbol with DW_AT_external and a
16416 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
16417 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
16418 with some versions of binutils) where shared libraries could have
16419 relocations against symbols in their debug information - the
16420 minimal symbol would have the right address, but the debug info
16421 would not. It's no longer necessary, because we will explicitly
16422 apply relocations when we read in the debug information now. */
16424 /* A DW_AT_location attribute with no contents indicates that a
16425 variable has been optimized away. */
16426 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
16428 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
16432 /* Handle one degenerate form of location expression specially, to
16433 preserve GDB's previous behavior when section offsets are
16434 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
16435 then mark this symbol as LOC_STATIC. */
16437 if (attr_form_is_block (attr)
16438 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
16439 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
16440 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
16441 && (DW_BLOCK (attr)->size
16442 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
16444 unsigned int dummy;
16446 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
16447 SYMBOL_VALUE_ADDRESS (sym) =
16448 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
16450 SYMBOL_VALUE_ADDRESS (sym) =
16451 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
16452 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
16453 fixup_symbol_section (sym, objfile);
16454 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
16455 SYMBOL_SECTION (sym));
16459 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
16460 expression evaluator, and use LOC_COMPUTED only when necessary
16461 (i.e. when the value of a register or memory location is
16462 referenced, or a thread-local block, etc.). Then again, it might
16463 not be worthwhile. I'm assuming that it isn't unless performance
16464 or memory numbers show me otherwise. */
16466 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
16468 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
16469 cu->has_loclist = 1;
16472 /* Given a pointer to a DWARF information entry, figure out if we need
16473 to make a symbol table entry for it, and if so, create a new entry
16474 and return a pointer to it.
16475 If TYPE is NULL, determine symbol type from the die, otherwise
16476 used the passed type.
16477 If SPACE is not NULL, use it to hold the new symbol. If it is
16478 NULL, allocate a new symbol on the objfile's obstack. */
16480 static struct symbol *
16481 new_symbol_full (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
16482 struct symbol *space)
16484 struct objfile *objfile = cu->objfile;
16485 struct symbol *sym = NULL;
16487 struct attribute *attr = NULL;
16488 struct attribute *attr2 = NULL;
16489 CORE_ADDR baseaddr;
16490 struct pending **list_to_add = NULL;
16492 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
16494 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
16496 name = dwarf2_name (die, cu);
16499 const char *linkagename;
16500 int suppress_add = 0;
16505 sym = allocate_symbol (objfile);
16506 OBJSTAT (objfile, n_syms++);
16508 /* Cache this symbol's name and the name's demangled form (if any). */
16509 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
16510 linkagename = dwarf2_physname (name, die, cu);
16511 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
16513 /* Fortran does not have mangling standard and the mangling does differ
16514 between gfortran, iFort etc. */
16515 if (cu->language == language_fortran
16516 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
16517 symbol_set_demangled_name (&(sym->ginfo),
16518 dwarf2_full_name (name, die, cu),
16521 /* Default assumptions.
16522 Use the passed type or decode it from the die. */
16523 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
16524 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
16526 SYMBOL_TYPE (sym) = type;
16528 SYMBOL_TYPE (sym) = die_type (die, cu);
16529 attr = dwarf2_attr (die,
16530 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
16534 SYMBOL_LINE (sym) = DW_UNSND (attr);
16537 attr = dwarf2_attr (die,
16538 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
16542 int file_index = DW_UNSND (attr);
16544 if (cu->line_header == NULL
16545 || file_index > cu->line_header->num_file_names)
16546 complaint (&symfile_complaints,
16547 _("file index out of range"));
16548 else if (file_index > 0)
16550 struct file_entry *fe;
16552 fe = &cu->line_header->file_names[file_index - 1];
16553 SYMBOL_SYMTAB (sym) = fe->symtab;
16560 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
16563 SYMBOL_VALUE_ADDRESS (sym) = DW_ADDR (attr) + baseaddr;
16565 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
16566 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
16567 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
16568 add_symbol_to_list (sym, cu->list_in_scope);
16570 case DW_TAG_subprogram:
16571 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
16573 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
16574 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16575 if ((attr2 && (DW_UNSND (attr2) != 0))
16576 || cu->language == language_ada)
16578 /* Subprograms marked external are stored as a global symbol.
16579 Ada subprograms, whether marked external or not, are always
16580 stored as a global symbol, because we want to be able to
16581 access them globally. For instance, we want to be able
16582 to break on a nested subprogram without having to
16583 specify the context. */
16584 list_to_add = &global_symbols;
16588 list_to_add = cu->list_in_scope;
16591 case DW_TAG_inlined_subroutine:
16592 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
16594 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
16595 SYMBOL_INLINED (sym) = 1;
16596 list_to_add = cu->list_in_scope;
16598 case DW_TAG_template_value_param:
16600 /* Fall through. */
16601 case DW_TAG_constant:
16602 case DW_TAG_variable:
16603 case DW_TAG_member:
16604 /* Compilation with minimal debug info may result in
16605 variables with missing type entries. Change the
16606 misleading `void' type to something sensible. */
16607 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
16609 = objfile_type (objfile)->nodebug_data_symbol;
16611 attr = dwarf2_attr (die, DW_AT_const_value, cu);
16612 /* In the case of DW_TAG_member, we should only be called for
16613 static const members. */
16614 if (die->tag == DW_TAG_member)
16616 /* dwarf2_add_field uses die_is_declaration,
16617 so we do the same. */
16618 gdb_assert (die_is_declaration (die, cu));
16623 dwarf2_const_value (attr, sym, cu);
16624 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16627 if (attr2 && (DW_UNSND (attr2) != 0))
16628 list_to_add = &global_symbols;
16630 list_to_add = cu->list_in_scope;
16634 attr = dwarf2_attr (die, DW_AT_location, cu);
16637 var_decode_location (attr, sym, cu);
16638 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16640 /* Fortran explicitly imports any global symbols to the local
16641 scope by DW_TAG_common_block. */
16642 if (cu->language == language_fortran && die->parent
16643 && die->parent->tag == DW_TAG_common_block)
16646 if (SYMBOL_CLASS (sym) == LOC_STATIC
16647 && SYMBOL_VALUE_ADDRESS (sym) == 0
16648 && !dwarf2_per_objfile->has_section_at_zero)
16650 /* When a static variable is eliminated by the linker,
16651 the corresponding debug information is not stripped
16652 out, but the variable address is set to null;
16653 do not add such variables into symbol table. */
16655 else if (attr2 && (DW_UNSND (attr2) != 0))
16657 /* Workaround gfortran PR debug/40040 - it uses
16658 DW_AT_location for variables in -fPIC libraries which may
16659 get overriden by other libraries/executable and get
16660 a different address. Resolve it by the minimal symbol
16661 which may come from inferior's executable using copy
16662 relocation. Make this workaround only for gfortran as for
16663 other compilers GDB cannot guess the minimal symbol
16664 Fortran mangling kind. */
16665 if (cu->language == language_fortran && die->parent
16666 && die->parent->tag == DW_TAG_module
16668 && strncmp (cu->producer, "GNU Fortran ", 12) == 0)
16669 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
16671 /* A variable with DW_AT_external is never static,
16672 but it may be block-scoped. */
16673 list_to_add = (cu->list_in_scope == &file_symbols
16674 ? &global_symbols : cu->list_in_scope);
16677 list_to_add = cu->list_in_scope;
16681 /* We do not know the address of this symbol.
16682 If it is an external symbol and we have type information
16683 for it, enter the symbol as a LOC_UNRESOLVED symbol.
16684 The address of the variable will then be determined from
16685 the minimal symbol table whenever the variable is
16687 attr2 = dwarf2_attr (die, DW_AT_external, cu);
16689 /* Fortran explicitly imports any global symbols to the local
16690 scope by DW_TAG_common_block. */
16691 if (cu->language == language_fortran && die->parent
16692 && die->parent->tag == DW_TAG_common_block)
16694 /* SYMBOL_CLASS doesn't matter here because
16695 read_common_block is going to reset it. */
16697 list_to_add = cu->list_in_scope;
16699 else if (attr2 && (DW_UNSND (attr2) != 0)
16700 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
16702 /* A variable with DW_AT_external is never static, but it
16703 may be block-scoped. */
16704 list_to_add = (cu->list_in_scope == &file_symbols
16705 ? &global_symbols : cu->list_in_scope);
16707 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
16709 else if (!die_is_declaration (die, cu))
16711 /* Use the default LOC_OPTIMIZED_OUT class. */
16712 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
16714 list_to_add = cu->list_in_scope;
16718 case DW_TAG_formal_parameter:
16719 /* If we are inside a function, mark this as an argument. If
16720 not, we might be looking at an argument to an inlined function
16721 when we do not have enough information to show inlined frames;
16722 pretend it's a local variable in that case so that the user can
16724 if (context_stack_depth > 0
16725 && context_stack[context_stack_depth - 1].name != NULL)
16726 SYMBOL_IS_ARGUMENT (sym) = 1;
16727 attr = dwarf2_attr (die, DW_AT_location, cu);
16730 var_decode_location (attr, sym, cu);
16732 attr = dwarf2_attr (die, DW_AT_const_value, cu);
16735 dwarf2_const_value (attr, sym, cu);
16738 list_to_add = cu->list_in_scope;
16740 case DW_TAG_unspecified_parameters:
16741 /* From varargs functions; gdb doesn't seem to have any
16742 interest in this information, so just ignore it for now.
16745 case DW_TAG_template_type_param:
16747 /* Fall through. */
16748 case DW_TAG_class_type:
16749 case DW_TAG_interface_type:
16750 case DW_TAG_structure_type:
16751 case DW_TAG_union_type:
16752 case DW_TAG_set_type:
16753 case DW_TAG_enumeration_type:
16754 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16755 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
16758 /* NOTE: carlton/2003-11-10: C++ and Java class symbols shouldn't
16759 really ever be static objects: otherwise, if you try
16760 to, say, break of a class's method and you're in a file
16761 which doesn't mention that class, it won't work unless
16762 the check for all static symbols in lookup_symbol_aux
16763 saves you. See the OtherFileClass tests in
16764 gdb.c++/namespace.exp. */
16768 list_to_add = (cu->list_in_scope == &file_symbols
16769 && (cu->language == language_cplus
16770 || cu->language == language_java)
16771 ? &global_symbols : cu->list_in_scope);
16773 /* The semantics of C++ state that "struct foo {
16774 ... }" also defines a typedef for "foo". A Java
16775 class declaration also defines a typedef for the
16777 if (cu->language == language_cplus
16778 || cu->language == language_java
16779 || cu->language == language_ada)
16781 /* The symbol's name is already allocated along
16782 with this objfile, so we don't need to
16783 duplicate it for the type. */
16784 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
16785 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
16790 case DW_TAG_typedef:
16791 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16792 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
16793 list_to_add = cu->list_in_scope;
16795 case DW_TAG_base_type:
16796 case DW_TAG_subrange_type:
16797 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16798 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
16799 list_to_add = cu->list_in_scope;
16801 case DW_TAG_enumerator:
16802 attr = dwarf2_attr (die, DW_AT_const_value, cu);
16805 dwarf2_const_value (attr, sym, cu);
16808 /* NOTE: carlton/2003-11-10: See comment above in the
16809 DW_TAG_class_type, etc. block. */
16811 list_to_add = (cu->list_in_scope == &file_symbols
16812 && (cu->language == language_cplus
16813 || cu->language == language_java)
16814 ? &global_symbols : cu->list_in_scope);
16817 case DW_TAG_namespace:
16818 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
16819 list_to_add = &global_symbols;
16821 case DW_TAG_common_block:
16822 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
16823 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
16824 add_symbol_to_list (sym, cu->list_in_scope);
16827 /* Not a tag we recognize. Hopefully we aren't processing
16828 trash data, but since we must specifically ignore things
16829 we don't recognize, there is nothing else we should do at
16831 complaint (&symfile_complaints, _("unsupported tag: '%s'"),
16832 dwarf_tag_name (die->tag));
16838 sym->hash_next = objfile->template_symbols;
16839 objfile->template_symbols = sym;
16840 list_to_add = NULL;
16843 if (list_to_add != NULL)
16844 add_symbol_to_list (sym, list_to_add);
16846 /* For the benefit of old versions of GCC, check for anonymous
16847 namespaces based on the demangled name. */
16848 if (!cu->processing_has_namespace_info
16849 && cu->language == language_cplus)
16850 cp_scan_for_anonymous_namespaces (sym, objfile);
16855 /* A wrapper for new_symbol_full that always allocates a new symbol. */
16857 static struct symbol *
16858 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
16860 return new_symbol_full (die, type, cu, NULL);
16863 /* Given an attr with a DW_FORM_dataN value in host byte order,
16864 zero-extend it as appropriate for the symbol's type. The DWARF
16865 standard (v4) is not entirely clear about the meaning of using
16866 DW_FORM_dataN for a constant with a signed type, where the type is
16867 wider than the data. The conclusion of a discussion on the DWARF
16868 list was that this is unspecified. We choose to always zero-extend
16869 because that is the interpretation long in use by GCC. */
16872 dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack,
16873 struct dwarf2_cu *cu, LONGEST *value, int bits)
16875 struct objfile *objfile = cu->objfile;
16876 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
16877 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
16878 LONGEST l = DW_UNSND (attr);
16880 if (bits < sizeof (*value) * 8)
16882 l &= ((LONGEST) 1 << bits) - 1;
16885 else if (bits == sizeof (*value) * 8)
16889 gdb_byte *bytes = obstack_alloc (obstack, bits / 8);
16890 store_unsigned_integer (bytes, bits / 8, byte_order, l);
16897 /* Read a constant value from an attribute. Either set *VALUE, or if
16898 the value does not fit in *VALUE, set *BYTES - either already
16899 allocated on the objfile obstack, or newly allocated on OBSTACK,
16900 or, set *BATON, if we translated the constant to a location
16904 dwarf2_const_value_attr (const struct attribute *attr, struct type *type,
16905 const char *name, struct obstack *obstack,
16906 struct dwarf2_cu *cu,
16907 LONGEST *value, const gdb_byte **bytes,
16908 struct dwarf2_locexpr_baton **baton)
16910 struct objfile *objfile = cu->objfile;
16911 struct comp_unit_head *cu_header = &cu->header;
16912 struct dwarf_block *blk;
16913 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
16914 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
16920 switch (attr->form)
16923 case DW_FORM_GNU_addr_index:
16927 if (TYPE_LENGTH (type) != cu_header->addr_size)
16928 dwarf2_const_value_length_mismatch_complaint (name,
16929 cu_header->addr_size,
16930 TYPE_LENGTH (type));
16931 /* Symbols of this form are reasonably rare, so we just
16932 piggyback on the existing location code rather than writing
16933 a new implementation of symbol_computed_ops. */
16934 *baton = obstack_alloc (obstack, sizeof (struct dwarf2_locexpr_baton));
16935 (*baton)->per_cu = cu->per_cu;
16936 gdb_assert ((*baton)->per_cu);
16938 (*baton)->size = 2 + cu_header->addr_size;
16939 data = obstack_alloc (obstack, (*baton)->size);
16940 (*baton)->data = data;
16942 data[0] = DW_OP_addr;
16943 store_unsigned_integer (&data[1], cu_header->addr_size,
16944 byte_order, DW_ADDR (attr));
16945 data[cu_header->addr_size + 1] = DW_OP_stack_value;
16948 case DW_FORM_string:
16950 case DW_FORM_GNU_str_index:
16951 case DW_FORM_GNU_strp_alt:
16952 /* DW_STRING is already allocated on the objfile obstack, point
16954 *bytes = (const gdb_byte *) DW_STRING (attr);
16956 case DW_FORM_block1:
16957 case DW_FORM_block2:
16958 case DW_FORM_block4:
16959 case DW_FORM_block:
16960 case DW_FORM_exprloc:
16961 blk = DW_BLOCK (attr);
16962 if (TYPE_LENGTH (type) != blk->size)
16963 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
16964 TYPE_LENGTH (type));
16965 *bytes = blk->data;
16968 /* The DW_AT_const_value attributes are supposed to carry the
16969 symbol's value "represented as it would be on the target
16970 architecture." By the time we get here, it's already been
16971 converted to host endianness, so we just need to sign- or
16972 zero-extend it as appropriate. */
16973 case DW_FORM_data1:
16974 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
16976 case DW_FORM_data2:
16977 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
16979 case DW_FORM_data4:
16980 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
16982 case DW_FORM_data8:
16983 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
16986 case DW_FORM_sdata:
16987 *value = DW_SND (attr);
16990 case DW_FORM_udata:
16991 *value = DW_UNSND (attr);
16995 complaint (&symfile_complaints,
16996 _("unsupported const value attribute form: '%s'"),
16997 dwarf_form_name (attr->form));
17004 /* Copy constant value from an attribute to a symbol. */
17007 dwarf2_const_value (const struct attribute *attr, struct symbol *sym,
17008 struct dwarf2_cu *cu)
17010 struct objfile *objfile = cu->objfile;
17011 struct comp_unit_head *cu_header = &cu->header;
17013 const gdb_byte *bytes;
17014 struct dwarf2_locexpr_baton *baton;
17016 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
17017 SYMBOL_PRINT_NAME (sym),
17018 &objfile->objfile_obstack, cu,
17019 &value, &bytes, &baton);
17023 SYMBOL_LOCATION_BATON (sym) = baton;
17024 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
17026 else if (bytes != NULL)
17028 SYMBOL_VALUE_BYTES (sym) = bytes;
17029 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
17033 SYMBOL_VALUE (sym) = value;
17034 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
17038 /* Return the type of the die in question using its DW_AT_type attribute. */
17040 static struct type *
17041 die_type (struct die_info *die, struct dwarf2_cu *cu)
17043 struct attribute *type_attr;
17045 type_attr = dwarf2_attr (die, DW_AT_type, cu);
17048 /* A missing DW_AT_type represents a void type. */
17049 return objfile_type (cu->objfile)->builtin_void;
17052 return lookup_die_type (die, type_attr, cu);
17055 /* True iff CU's producer generates GNAT Ada auxiliary information
17056 that allows to find parallel types through that information instead
17057 of having to do expensive parallel lookups by type name. */
17060 need_gnat_info (struct dwarf2_cu *cu)
17062 /* FIXME: brobecker/2010-10-12: As of now, only the AdaCore version
17063 of GNAT produces this auxiliary information, without any indication
17064 that it is produced. Part of enhancing the FSF version of GNAT
17065 to produce that information will be to put in place an indicator
17066 that we can use in order to determine whether the descriptive type
17067 info is available or not. One suggestion that has been made is
17068 to use a new attribute, attached to the CU die. For now, assume
17069 that the descriptive type info is not available. */
17073 /* Return the auxiliary type of the die in question using its
17074 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
17075 attribute is not present. */
17077 static struct type *
17078 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
17080 struct attribute *type_attr;
17082 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
17086 return lookup_die_type (die, type_attr, cu);
17089 /* If DIE has a descriptive_type attribute, then set the TYPE's
17090 descriptive type accordingly. */
17093 set_descriptive_type (struct type *type, struct die_info *die,
17094 struct dwarf2_cu *cu)
17096 struct type *descriptive_type = die_descriptive_type (die, cu);
17098 if (descriptive_type)
17100 ALLOCATE_GNAT_AUX_TYPE (type);
17101 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
17105 /* Return the containing type of the die in question using its
17106 DW_AT_containing_type attribute. */
17108 static struct type *
17109 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
17111 struct attribute *type_attr;
17113 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
17115 error (_("Dwarf Error: Problem turning containing type into gdb type "
17116 "[in module %s]"), objfile_name (cu->objfile));
17118 return lookup_die_type (die, type_attr, cu);
17121 /* Return an error marker type to use for the ill formed type in DIE/CU. */
17123 static struct type *
17124 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
17126 struct objfile *objfile = dwarf2_per_objfile->objfile;
17127 char *message, *saved;
17129 message = xstrprintf (_("<unknown type in %s, CU 0x%x, DIE 0x%x>"),
17130 objfile_name (objfile),
17131 cu->header.offset.sect_off,
17132 die->offset.sect_off);
17133 saved = obstack_copy0 (&objfile->objfile_obstack,
17134 message, strlen (message));
17137 return init_type (TYPE_CODE_ERROR, 0, 0, saved, objfile);
17140 /* Look up the type of DIE in CU using its type attribute ATTR.
17141 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
17142 DW_AT_containing_type.
17143 If there is no type substitute an error marker. */
17145 static struct type *
17146 lookup_die_type (struct die_info *die, const struct attribute *attr,
17147 struct dwarf2_cu *cu)
17149 struct objfile *objfile = cu->objfile;
17150 struct type *this_type;
17152 gdb_assert (attr->name == DW_AT_type
17153 || attr->name == DW_AT_GNAT_descriptive_type
17154 || attr->name == DW_AT_containing_type);
17156 /* First see if we have it cached. */
17158 if (attr->form == DW_FORM_GNU_ref_alt)
17160 struct dwarf2_per_cu_data *per_cu;
17161 sect_offset offset = dwarf2_get_ref_die_offset (attr);
17163 per_cu = dwarf2_find_containing_comp_unit (offset, 1, cu->objfile);
17164 this_type = get_die_type_at_offset (offset, per_cu);
17166 else if (attr_form_is_ref (attr))
17168 sect_offset offset = dwarf2_get_ref_die_offset (attr);
17170 this_type = get_die_type_at_offset (offset, cu->per_cu);
17172 else if (attr->form == DW_FORM_ref_sig8)
17174 ULONGEST signature = DW_SIGNATURE (attr);
17176 return get_signatured_type (die, signature, cu);
17180 complaint (&symfile_complaints,
17181 _("Dwarf Error: Bad type attribute %s in DIE"
17182 " at 0x%x [in module %s]"),
17183 dwarf_attr_name (attr->name), die->offset.sect_off,
17184 objfile_name (objfile));
17185 return build_error_marker_type (cu, die);
17188 /* If not cached we need to read it in. */
17190 if (this_type == NULL)
17192 struct die_info *type_die = NULL;
17193 struct dwarf2_cu *type_cu = cu;
17195 if (attr_form_is_ref (attr))
17196 type_die = follow_die_ref (die, attr, &type_cu);
17197 if (type_die == NULL)
17198 return build_error_marker_type (cu, die);
17199 /* If we find the type now, it's probably because the type came
17200 from an inter-CU reference and the type's CU got expanded before
17202 this_type = read_type_die (type_die, type_cu);
17205 /* If we still don't have a type use an error marker. */
17207 if (this_type == NULL)
17208 return build_error_marker_type (cu, die);
17213 /* Return the type in DIE, CU.
17214 Returns NULL for invalid types.
17216 This first does a lookup in die_type_hash,
17217 and only reads the die in if necessary.
17219 NOTE: This can be called when reading in partial or full symbols. */
17221 static struct type *
17222 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
17224 struct type *this_type;
17226 this_type = get_die_type (die, cu);
17230 return read_type_die_1 (die, cu);
17233 /* Read the type in DIE, CU.
17234 Returns NULL for invalid types. */
17236 static struct type *
17237 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
17239 struct type *this_type = NULL;
17243 case DW_TAG_class_type:
17244 case DW_TAG_interface_type:
17245 case DW_TAG_structure_type:
17246 case DW_TAG_union_type:
17247 this_type = read_structure_type (die, cu);
17249 case DW_TAG_enumeration_type:
17250 this_type = read_enumeration_type (die, cu);
17252 case DW_TAG_subprogram:
17253 case DW_TAG_subroutine_type:
17254 case DW_TAG_inlined_subroutine:
17255 this_type = read_subroutine_type (die, cu);
17257 case DW_TAG_array_type:
17258 this_type = read_array_type (die, cu);
17260 case DW_TAG_set_type:
17261 this_type = read_set_type (die, cu);
17263 case DW_TAG_pointer_type:
17264 this_type = read_tag_pointer_type (die, cu);
17266 case DW_TAG_ptr_to_member_type:
17267 this_type = read_tag_ptr_to_member_type (die, cu);
17269 case DW_TAG_reference_type:
17270 this_type = read_tag_reference_type (die, cu);
17272 case DW_TAG_const_type:
17273 this_type = read_tag_const_type (die, cu);
17275 case DW_TAG_volatile_type:
17276 this_type = read_tag_volatile_type (die, cu);
17278 case DW_TAG_restrict_type:
17279 this_type = read_tag_restrict_type (die, cu);
17281 case DW_TAG_string_type:
17282 this_type = read_tag_string_type (die, cu);
17284 case DW_TAG_typedef:
17285 this_type = read_typedef (die, cu);
17287 case DW_TAG_subrange_type:
17288 this_type = read_subrange_type (die, cu);
17290 case DW_TAG_base_type:
17291 this_type = read_base_type (die, cu);
17293 case DW_TAG_unspecified_type:
17294 this_type = read_unspecified_type (die, cu);
17296 case DW_TAG_namespace:
17297 this_type = read_namespace_type (die, cu);
17299 case DW_TAG_module:
17300 this_type = read_module_type (die, cu);
17303 complaint (&symfile_complaints,
17304 _("unexpected tag in read_type_die: '%s'"),
17305 dwarf_tag_name (die->tag));
17312 /* See if we can figure out if the class lives in a namespace. We do
17313 this by looking for a member function; its demangled name will
17314 contain namespace info, if there is any.
17315 Return the computed name or NULL.
17316 Space for the result is allocated on the objfile's obstack.
17317 This is the full-die version of guess_partial_die_structure_name.
17318 In this case we know DIE has no useful parent. */
17321 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
17323 struct die_info *spec_die;
17324 struct dwarf2_cu *spec_cu;
17325 struct die_info *child;
17328 spec_die = die_specification (die, &spec_cu);
17329 if (spec_die != NULL)
17335 for (child = die->child;
17337 child = child->sibling)
17339 if (child->tag == DW_TAG_subprogram)
17341 struct attribute *attr;
17343 attr = dwarf2_attr (child, DW_AT_linkage_name, cu);
17345 attr = dwarf2_attr (child, DW_AT_MIPS_linkage_name, cu);
17349 = language_class_name_from_physname (cu->language_defn,
17353 if (actual_name != NULL)
17355 const char *die_name = dwarf2_name (die, cu);
17357 if (die_name != NULL
17358 && strcmp (die_name, actual_name) != 0)
17360 /* Strip off the class name from the full name.
17361 We want the prefix. */
17362 int die_name_len = strlen (die_name);
17363 int actual_name_len = strlen (actual_name);
17365 /* Test for '::' as a sanity check. */
17366 if (actual_name_len > die_name_len + 2
17367 && actual_name[actual_name_len
17368 - die_name_len - 1] == ':')
17370 obstack_copy0 (&cu->objfile->objfile_obstack,
17372 actual_name_len - die_name_len - 2);
17375 xfree (actual_name);
17384 /* GCC might emit a nameless typedef that has a linkage name. Determine the
17385 prefix part in such case. See
17386 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
17389 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
17391 struct attribute *attr;
17394 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
17395 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
17398 attr = dwarf2_attr (die, DW_AT_name, cu);
17399 if (attr != NULL && DW_STRING (attr) != NULL)
17402 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
17404 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
17405 if (attr == NULL || DW_STRING (attr) == NULL)
17408 /* dwarf2_name had to be already called. */
17409 gdb_assert (DW_STRING_IS_CANONICAL (attr));
17411 /* Strip the base name, keep any leading namespaces/classes. */
17412 base = strrchr (DW_STRING (attr), ':');
17413 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
17416 return obstack_copy0 (&cu->objfile->objfile_obstack,
17417 DW_STRING (attr), &base[-1] - DW_STRING (attr));
17420 /* Return the name of the namespace/class that DIE is defined within,
17421 or "" if we can't tell. The caller should not xfree the result.
17423 For example, if we're within the method foo() in the following
17433 then determine_prefix on foo's die will return "N::C". */
17435 static const char *
17436 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
17438 struct die_info *parent, *spec_die;
17439 struct dwarf2_cu *spec_cu;
17440 struct type *parent_type;
17443 if (cu->language != language_cplus && cu->language != language_java
17444 && cu->language != language_fortran)
17447 retval = anonymous_struct_prefix (die, cu);
17451 /* We have to be careful in the presence of DW_AT_specification.
17452 For example, with GCC 3.4, given the code
17456 // Definition of N::foo.
17460 then we'll have a tree of DIEs like this:
17462 1: DW_TAG_compile_unit
17463 2: DW_TAG_namespace // N
17464 3: DW_TAG_subprogram // declaration of N::foo
17465 4: DW_TAG_subprogram // definition of N::foo
17466 DW_AT_specification // refers to die #3
17468 Thus, when processing die #4, we have to pretend that we're in
17469 the context of its DW_AT_specification, namely the contex of die
17472 spec_die = die_specification (die, &spec_cu);
17473 if (spec_die == NULL)
17474 parent = die->parent;
17477 parent = spec_die->parent;
17481 if (parent == NULL)
17483 else if (parent->building_fullname)
17486 const char *parent_name;
17488 /* It has been seen on RealView 2.2 built binaries,
17489 DW_TAG_template_type_param types actually _defined_ as
17490 children of the parent class:
17493 template class <class Enum> Class{};
17494 Class<enum E> class_e;
17496 1: DW_TAG_class_type (Class)
17497 2: DW_TAG_enumeration_type (E)
17498 3: DW_TAG_enumerator (enum1:0)
17499 3: DW_TAG_enumerator (enum2:1)
17501 2: DW_TAG_template_type_param
17502 DW_AT_type DW_FORM_ref_udata (E)
17504 Besides being broken debug info, it can put GDB into an
17505 infinite loop. Consider:
17507 When we're building the full name for Class<E>, we'll start
17508 at Class, and go look over its template type parameters,
17509 finding E. We'll then try to build the full name of E, and
17510 reach here. We're now trying to build the full name of E,
17511 and look over the parent DIE for containing scope. In the
17512 broken case, if we followed the parent DIE of E, we'd again
17513 find Class, and once again go look at its template type
17514 arguments, etc., etc. Simply don't consider such parent die
17515 as source-level parent of this die (it can't be, the language
17516 doesn't allow it), and break the loop here. */
17517 name = dwarf2_name (die, cu);
17518 parent_name = dwarf2_name (parent, cu);
17519 complaint (&symfile_complaints,
17520 _("template param type '%s' defined within parent '%s'"),
17521 name ? name : "<unknown>",
17522 parent_name ? parent_name : "<unknown>");
17526 switch (parent->tag)
17528 case DW_TAG_namespace:
17529 parent_type = read_type_die (parent, cu);
17530 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
17531 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
17532 Work around this problem here. */
17533 if (cu->language == language_cplus
17534 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0)
17536 /* We give a name to even anonymous namespaces. */
17537 return TYPE_TAG_NAME (parent_type);
17538 case DW_TAG_class_type:
17539 case DW_TAG_interface_type:
17540 case DW_TAG_structure_type:
17541 case DW_TAG_union_type:
17542 case DW_TAG_module:
17543 parent_type = read_type_die (parent, cu);
17544 if (TYPE_TAG_NAME (parent_type) != NULL)
17545 return TYPE_TAG_NAME (parent_type);
17547 /* An anonymous structure is only allowed non-static data
17548 members; no typedefs, no member functions, et cetera.
17549 So it does not need a prefix. */
17551 case DW_TAG_compile_unit:
17552 case DW_TAG_partial_unit:
17553 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
17554 if (cu->language == language_cplus
17555 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
17556 && die->child != NULL
17557 && (die->tag == DW_TAG_class_type
17558 || die->tag == DW_TAG_structure_type
17559 || die->tag == DW_TAG_union_type))
17561 char *name = guess_full_die_structure_name (die, cu);
17567 return determine_prefix (parent, cu);
17571 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
17572 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
17573 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
17574 an obconcat, otherwise allocate storage for the result. The CU argument is
17575 used to determine the language and hence, the appropriate separator. */
17577 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
17580 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
17581 int physname, struct dwarf2_cu *cu)
17583 const char *lead = "";
17586 if (suffix == NULL || suffix[0] == '\0'
17587 || prefix == NULL || prefix[0] == '\0')
17589 else if (cu->language == language_java)
17591 else if (cu->language == language_fortran && physname)
17593 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
17594 DW_AT_MIPS_linkage_name is preferred and used instead. */
17602 if (prefix == NULL)
17604 if (suffix == NULL)
17610 = xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1);
17612 strcpy (retval, lead);
17613 strcat (retval, prefix);
17614 strcat (retval, sep);
17615 strcat (retval, suffix);
17620 /* We have an obstack. */
17621 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
17625 /* Return sibling of die, NULL if no sibling. */
17627 static struct die_info *
17628 sibling_die (struct die_info *die)
17630 return die->sibling;
17633 /* Get name of a die, return NULL if not found. */
17635 static const char *
17636 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
17637 struct obstack *obstack)
17639 if (name && cu->language == language_cplus)
17641 char *canon_name = cp_canonicalize_string (name);
17643 if (canon_name != NULL)
17645 if (strcmp (canon_name, name) != 0)
17646 name = obstack_copy0 (obstack, canon_name, strlen (canon_name));
17647 xfree (canon_name);
17654 /* Get name of a die, return NULL if not found. */
17656 static const char *
17657 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
17659 struct attribute *attr;
17661 attr = dwarf2_attr (die, DW_AT_name, cu);
17662 if ((!attr || !DW_STRING (attr))
17663 && die->tag != DW_TAG_class_type
17664 && die->tag != DW_TAG_interface_type
17665 && die->tag != DW_TAG_structure_type
17666 && die->tag != DW_TAG_union_type)
17671 case DW_TAG_compile_unit:
17672 case DW_TAG_partial_unit:
17673 /* Compilation units have a DW_AT_name that is a filename, not
17674 a source language identifier. */
17675 case DW_TAG_enumeration_type:
17676 case DW_TAG_enumerator:
17677 /* These tags always have simple identifiers already; no need
17678 to canonicalize them. */
17679 return DW_STRING (attr);
17681 case DW_TAG_subprogram:
17682 /* Java constructors will all be named "<init>", so return
17683 the class name when we see this special case. */
17684 if (cu->language == language_java
17685 && DW_STRING (attr) != NULL
17686 && strcmp (DW_STRING (attr), "<init>") == 0)
17688 struct dwarf2_cu *spec_cu = cu;
17689 struct die_info *spec_die;
17691 /* GCJ will output '<init>' for Java constructor names.
17692 For this special case, return the name of the parent class. */
17694 /* GCJ may output suprogram DIEs with AT_specification set.
17695 If so, use the name of the specified DIE. */
17696 spec_die = die_specification (die, &spec_cu);
17697 if (spec_die != NULL)
17698 return dwarf2_name (spec_die, spec_cu);
17703 if (die->tag == DW_TAG_class_type)
17704 return dwarf2_name (die, cu);
17706 while (die->tag != DW_TAG_compile_unit
17707 && die->tag != DW_TAG_partial_unit);
17711 case DW_TAG_class_type:
17712 case DW_TAG_interface_type:
17713 case DW_TAG_structure_type:
17714 case DW_TAG_union_type:
17715 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
17716 structures or unions. These were of the form "._%d" in GCC 4.1,
17717 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
17718 and GCC 4.4. We work around this problem by ignoring these. */
17719 if (attr && DW_STRING (attr)
17720 && (strncmp (DW_STRING (attr), "._", 2) == 0
17721 || strncmp (DW_STRING (attr), "<anonymous", 10) == 0))
17724 /* GCC might emit a nameless typedef that has a linkage name. See
17725 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
17726 if (!attr || DW_STRING (attr) == NULL)
17728 char *demangled = NULL;
17730 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
17732 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
17734 if (attr == NULL || DW_STRING (attr) == NULL)
17737 /* Avoid demangling DW_STRING (attr) the second time on a second
17738 call for the same DIE. */
17739 if (!DW_STRING_IS_CANONICAL (attr))
17740 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
17746 /* FIXME: we already did this for the partial symbol... */
17747 DW_STRING (attr) = obstack_copy0 (&cu->objfile->objfile_obstack,
17748 demangled, strlen (demangled));
17749 DW_STRING_IS_CANONICAL (attr) = 1;
17752 /* Strip any leading namespaces/classes, keep only the base name.
17753 DW_AT_name for named DIEs does not contain the prefixes. */
17754 base = strrchr (DW_STRING (attr), ':');
17755 if (base && base > DW_STRING (attr) && base[-1] == ':')
17758 return DW_STRING (attr);
17767 if (!DW_STRING_IS_CANONICAL (attr))
17770 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
17771 &cu->objfile->objfile_obstack);
17772 DW_STRING_IS_CANONICAL (attr) = 1;
17774 return DW_STRING (attr);
17777 /* Return the die that this die in an extension of, or NULL if there
17778 is none. *EXT_CU is the CU containing DIE on input, and the CU
17779 containing the return value on output. */
17781 static struct die_info *
17782 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
17784 struct attribute *attr;
17786 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
17790 return follow_die_ref (die, attr, ext_cu);
17793 /* Convert a DIE tag into its string name. */
17795 static const char *
17796 dwarf_tag_name (unsigned tag)
17798 const char *name = get_DW_TAG_name (tag);
17801 return "DW_TAG_<unknown>";
17806 /* Convert a DWARF attribute code into its string name. */
17808 static const char *
17809 dwarf_attr_name (unsigned attr)
17813 #ifdef MIPS /* collides with DW_AT_HP_block_index */
17814 if (attr == DW_AT_MIPS_fde)
17815 return "DW_AT_MIPS_fde";
17817 if (attr == DW_AT_HP_block_index)
17818 return "DW_AT_HP_block_index";
17821 name = get_DW_AT_name (attr);
17824 return "DW_AT_<unknown>";
17829 /* Convert a DWARF value form code into its string name. */
17831 static const char *
17832 dwarf_form_name (unsigned form)
17834 const char *name = get_DW_FORM_name (form);
17837 return "DW_FORM_<unknown>";
17843 dwarf_bool_name (unsigned mybool)
17851 /* Convert a DWARF type code into its string name. */
17853 static const char *
17854 dwarf_type_encoding_name (unsigned enc)
17856 const char *name = get_DW_ATE_name (enc);
17859 return "DW_ATE_<unknown>";
17865 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
17869 print_spaces (indent, f);
17870 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset 0x%x)\n",
17871 dwarf_tag_name (die->tag), die->abbrev, die->offset.sect_off);
17873 if (die->parent != NULL)
17875 print_spaces (indent, f);
17876 fprintf_unfiltered (f, " parent at offset: 0x%x\n",
17877 die->parent->offset.sect_off);
17880 print_spaces (indent, f);
17881 fprintf_unfiltered (f, " has children: %s\n",
17882 dwarf_bool_name (die->child != NULL));
17884 print_spaces (indent, f);
17885 fprintf_unfiltered (f, " attributes:\n");
17887 for (i = 0; i < die->num_attrs; ++i)
17889 print_spaces (indent, f);
17890 fprintf_unfiltered (f, " %s (%s) ",
17891 dwarf_attr_name (die->attrs[i].name),
17892 dwarf_form_name (die->attrs[i].form));
17894 switch (die->attrs[i].form)
17897 case DW_FORM_GNU_addr_index:
17898 fprintf_unfiltered (f, "address: ");
17899 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
17901 case DW_FORM_block2:
17902 case DW_FORM_block4:
17903 case DW_FORM_block:
17904 case DW_FORM_block1:
17905 fprintf_unfiltered (f, "block: size %s",
17906 pulongest (DW_BLOCK (&die->attrs[i])->size));
17908 case DW_FORM_exprloc:
17909 fprintf_unfiltered (f, "expression: size %s",
17910 pulongest (DW_BLOCK (&die->attrs[i])->size));
17912 case DW_FORM_ref_addr:
17913 fprintf_unfiltered (f, "ref address: ");
17914 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
17916 case DW_FORM_GNU_ref_alt:
17917 fprintf_unfiltered (f, "alt ref address: ");
17918 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
17924 case DW_FORM_ref_udata:
17925 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
17926 (long) (DW_UNSND (&die->attrs[i])));
17928 case DW_FORM_data1:
17929 case DW_FORM_data2:
17930 case DW_FORM_data4:
17931 case DW_FORM_data8:
17932 case DW_FORM_udata:
17933 case DW_FORM_sdata:
17934 fprintf_unfiltered (f, "constant: %s",
17935 pulongest (DW_UNSND (&die->attrs[i])));
17937 case DW_FORM_sec_offset:
17938 fprintf_unfiltered (f, "section offset: %s",
17939 pulongest (DW_UNSND (&die->attrs[i])));
17941 case DW_FORM_ref_sig8:
17942 fprintf_unfiltered (f, "signature: %s",
17943 hex_string (DW_SIGNATURE (&die->attrs[i])));
17945 case DW_FORM_string:
17947 case DW_FORM_GNU_str_index:
17948 case DW_FORM_GNU_strp_alt:
17949 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
17950 DW_STRING (&die->attrs[i])
17951 ? DW_STRING (&die->attrs[i]) : "",
17952 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
17955 if (DW_UNSND (&die->attrs[i]))
17956 fprintf_unfiltered (f, "flag: TRUE");
17958 fprintf_unfiltered (f, "flag: FALSE");
17960 case DW_FORM_flag_present:
17961 fprintf_unfiltered (f, "flag: TRUE");
17963 case DW_FORM_indirect:
17964 /* The reader will have reduced the indirect form to
17965 the "base form" so this form should not occur. */
17966 fprintf_unfiltered (f,
17967 "unexpected attribute form: DW_FORM_indirect");
17970 fprintf_unfiltered (f, "unsupported attribute form: %d.",
17971 die->attrs[i].form);
17974 fprintf_unfiltered (f, "\n");
17979 dump_die_for_error (struct die_info *die)
17981 dump_die_shallow (gdb_stderr, 0, die);
17985 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
17987 int indent = level * 4;
17989 gdb_assert (die != NULL);
17991 if (level >= max_level)
17994 dump_die_shallow (f, indent, die);
17996 if (die->child != NULL)
17998 print_spaces (indent, f);
17999 fprintf_unfiltered (f, " Children:");
18000 if (level + 1 < max_level)
18002 fprintf_unfiltered (f, "\n");
18003 dump_die_1 (f, level + 1, max_level, die->child);
18007 fprintf_unfiltered (f,
18008 " [not printed, max nesting level reached]\n");
18012 if (die->sibling != NULL && level > 0)
18014 dump_die_1 (f, level, max_level, die->sibling);
18018 /* This is called from the pdie macro in gdbinit.in.
18019 It's not static so gcc will keep a copy callable from gdb. */
18022 dump_die (struct die_info *die, int max_level)
18024 dump_die_1 (gdb_stdlog, 0, max_level, die);
18028 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
18032 slot = htab_find_slot_with_hash (cu->die_hash, die, die->offset.sect_off,
18038 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
18042 dwarf2_get_ref_die_offset (const struct attribute *attr)
18044 sect_offset retval = { DW_UNSND (attr) };
18046 if (attr_form_is_ref (attr))
18049 retval.sect_off = 0;
18050 complaint (&symfile_complaints,
18051 _("unsupported die ref attribute form: '%s'"),
18052 dwarf_form_name (attr->form));
18056 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
18057 * the value held by the attribute is not constant. */
18060 dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value)
18062 if (attr->form == DW_FORM_sdata)
18063 return DW_SND (attr);
18064 else if (attr->form == DW_FORM_udata
18065 || attr->form == DW_FORM_data1
18066 || attr->form == DW_FORM_data2
18067 || attr->form == DW_FORM_data4
18068 || attr->form == DW_FORM_data8)
18069 return DW_UNSND (attr);
18072 complaint (&symfile_complaints,
18073 _("Attribute value is not a constant (%s)"),
18074 dwarf_form_name (attr->form));
18075 return default_value;
18079 /* Follow reference or signature attribute ATTR of SRC_DIE.
18080 On entry *REF_CU is the CU of SRC_DIE.
18081 On exit *REF_CU is the CU of the result. */
18083 static struct die_info *
18084 follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr,
18085 struct dwarf2_cu **ref_cu)
18087 struct die_info *die;
18089 if (attr_form_is_ref (attr))
18090 die = follow_die_ref (src_die, attr, ref_cu);
18091 else if (attr->form == DW_FORM_ref_sig8)
18092 die = follow_die_sig (src_die, attr, ref_cu);
18095 dump_die_for_error (src_die);
18096 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
18097 objfile_name ((*ref_cu)->objfile));
18103 /* Follow reference OFFSET.
18104 On entry *REF_CU is the CU of the source die referencing OFFSET.
18105 On exit *REF_CU is the CU of the result.
18106 Returns NULL if OFFSET is invalid. */
18108 static struct die_info *
18109 follow_die_offset (sect_offset offset, int offset_in_dwz,
18110 struct dwarf2_cu **ref_cu)
18112 struct die_info temp_die;
18113 struct dwarf2_cu *target_cu, *cu = *ref_cu;
18115 gdb_assert (cu->per_cu != NULL);
18119 if (cu->per_cu->is_debug_types)
18121 /* .debug_types CUs cannot reference anything outside their CU.
18122 If they need to, they have to reference a signatured type via
18123 DW_FORM_ref_sig8. */
18124 if (! offset_in_cu_p (&cu->header, offset))
18127 else if (offset_in_dwz != cu->per_cu->is_dwz
18128 || ! offset_in_cu_p (&cu->header, offset))
18130 struct dwarf2_per_cu_data *per_cu;
18132 per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz,
18135 /* If necessary, add it to the queue and load its DIEs. */
18136 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
18137 load_full_comp_unit (per_cu, cu->language);
18139 target_cu = per_cu->cu;
18141 else if (cu->dies == NULL)
18143 /* We're loading full DIEs during partial symbol reading. */
18144 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
18145 load_full_comp_unit (cu->per_cu, language_minimal);
18148 *ref_cu = target_cu;
18149 temp_die.offset = offset;
18150 return htab_find_with_hash (target_cu->die_hash, &temp_die, offset.sect_off);
18153 /* Follow reference attribute ATTR of SRC_DIE.
18154 On entry *REF_CU is the CU of SRC_DIE.
18155 On exit *REF_CU is the CU of the result. */
18157 static struct die_info *
18158 follow_die_ref (struct die_info *src_die, const struct attribute *attr,
18159 struct dwarf2_cu **ref_cu)
18161 sect_offset offset = dwarf2_get_ref_die_offset (attr);
18162 struct dwarf2_cu *cu = *ref_cu;
18163 struct die_info *die;
18165 die = follow_die_offset (offset,
18166 (attr->form == DW_FORM_GNU_ref_alt
18167 || cu->per_cu->is_dwz),
18170 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced from DIE "
18171 "at 0x%x [in module %s]"),
18172 offset.sect_off, src_die->offset.sect_off,
18173 objfile_name (cu->objfile));
18178 /* Return DWARF block referenced by DW_AT_location of DIE at OFFSET at PER_CU.
18179 Returned value is intended for DW_OP_call*. Returned
18180 dwarf2_locexpr_baton->data has lifetime of PER_CU->OBJFILE. */
18182 struct dwarf2_locexpr_baton
18183 dwarf2_fetch_die_loc_sect_off (sect_offset offset,
18184 struct dwarf2_per_cu_data *per_cu,
18185 CORE_ADDR (*get_frame_pc) (void *baton),
18188 struct dwarf2_cu *cu;
18189 struct die_info *die;
18190 struct attribute *attr;
18191 struct dwarf2_locexpr_baton retval;
18193 dw2_setup (per_cu->objfile);
18195 if (per_cu->cu == NULL)
18199 die = follow_die_offset (offset, per_cu->is_dwz, &cu);
18201 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
18202 offset.sect_off, objfile_name (per_cu->objfile));
18204 attr = dwarf2_attr (die, DW_AT_location, cu);
18207 /* DWARF: "If there is no such attribute, then there is no effect.".
18208 DATA is ignored if SIZE is 0. */
18210 retval.data = NULL;
18213 else if (attr_form_is_section_offset (attr))
18215 struct dwarf2_loclist_baton loclist_baton;
18216 CORE_ADDR pc = (*get_frame_pc) (baton);
18219 fill_in_loclist_baton (cu, &loclist_baton, attr);
18221 retval.data = dwarf2_find_location_expression (&loclist_baton,
18223 retval.size = size;
18227 if (!attr_form_is_block (attr))
18228 error (_("Dwarf Error: DIE at 0x%x referenced in module %s "
18229 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
18230 offset.sect_off, objfile_name (per_cu->objfile));
18232 retval.data = DW_BLOCK (attr)->data;
18233 retval.size = DW_BLOCK (attr)->size;
18235 retval.per_cu = cu->per_cu;
18237 age_cached_comp_units ();
18242 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
18245 struct dwarf2_locexpr_baton
18246 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
18247 struct dwarf2_per_cu_data *per_cu,
18248 CORE_ADDR (*get_frame_pc) (void *baton),
18251 sect_offset offset = { per_cu->offset.sect_off + offset_in_cu.cu_off };
18253 return dwarf2_fetch_die_loc_sect_off (offset, per_cu, get_frame_pc, baton);
18256 /* Write a constant of a given type as target-ordered bytes into
18259 static const gdb_byte *
18260 write_constant_as_bytes (struct obstack *obstack,
18261 enum bfd_endian byte_order,
18268 *len = TYPE_LENGTH (type);
18269 result = obstack_alloc (obstack, *len);
18270 store_unsigned_integer (result, *len, byte_order, value);
18275 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
18276 pointer to the constant bytes and set LEN to the length of the
18277 data. If memory is needed, allocate it on OBSTACK. If the DIE
18278 does not have a DW_AT_const_value, return NULL. */
18281 dwarf2_fetch_constant_bytes (sect_offset offset,
18282 struct dwarf2_per_cu_data *per_cu,
18283 struct obstack *obstack,
18286 struct dwarf2_cu *cu;
18287 struct die_info *die;
18288 struct attribute *attr;
18289 const gdb_byte *result = NULL;
18292 enum bfd_endian byte_order;
18294 dw2_setup (per_cu->objfile);
18296 if (per_cu->cu == NULL)
18300 die = follow_die_offset (offset, per_cu->is_dwz, &cu);
18302 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
18303 offset.sect_off, objfile_name (per_cu->objfile));
18306 attr = dwarf2_attr (die, DW_AT_const_value, cu);
18310 byte_order = (bfd_big_endian (per_cu->objfile->obfd)
18311 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
18313 switch (attr->form)
18316 case DW_FORM_GNU_addr_index:
18320 *len = cu->header.addr_size;
18321 tem = obstack_alloc (obstack, *len);
18322 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
18326 case DW_FORM_string:
18328 case DW_FORM_GNU_str_index:
18329 case DW_FORM_GNU_strp_alt:
18330 /* DW_STRING is already allocated on the objfile obstack, point
18332 result = (const gdb_byte *) DW_STRING (attr);
18333 *len = strlen (DW_STRING (attr));
18335 case DW_FORM_block1:
18336 case DW_FORM_block2:
18337 case DW_FORM_block4:
18338 case DW_FORM_block:
18339 case DW_FORM_exprloc:
18340 result = DW_BLOCK (attr)->data;
18341 *len = DW_BLOCK (attr)->size;
18344 /* The DW_AT_const_value attributes are supposed to carry the
18345 symbol's value "represented as it would be on the target
18346 architecture." By the time we get here, it's already been
18347 converted to host endianness, so we just need to sign- or
18348 zero-extend it as appropriate. */
18349 case DW_FORM_data1:
18350 type = die_type (die, cu);
18351 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
18352 if (result == NULL)
18353 result = write_constant_as_bytes (obstack, byte_order,
18356 case DW_FORM_data2:
18357 type = die_type (die, cu);
18358 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
18359 if (result == NULL)
18360 result = write_constant_as_bytes (obstack, byte_order,
18363 case DW_FORM_data4:
18364 type = die_type (die, cu);
18365 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
18366 if (result == NULL)
18367 result = write_constant_as_bytes (obstack, byte_order,
18370 case DW_FORM_data8:
18371 type = die_type (die, cu);
18372 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
18373 if (result == NULL)
18374 result = write_constant_as_bytes (obstack, byte_order,
18378 case DW_FORM_sdata:
18379 type = die_type (die, cu);
18380 result = write_constant_as_bytes (obstack, byte_order,
18381 type, DW_SND (attr), len);
18384 case DW_FORM_udata:
18385 type = die_type (die, cu);
18386 result = write_constant_as_bytes (obstack, byte_order,
18387 type, DW_UNSND (attr), len);
18391 complaint (&symfile_complaints,
18392 _("unsupported const value attribute form: '%s'"),
18393 dwarf_form_name (attr->form));
18400 /* Return the type of the DIE at DIE_OFFSET in the CU named by
18404 dwarf2_get_die_type (cu_offset die_offset,
18405 struct dwarf2_per_cu_data *per_cu)
18407 sect_offset die_offset_sect;
18409 dw2_setup (per_cu->objfile);
18411 die_offset_sect.sect_off = per_cu->offset.sect_off + die_offset.cu_off;
18412 return get_die_type_at_offset (die_offset_sect, per_cu);
18415 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
18416 On entry *REF_CU is the CU of SRC_DIE.
18417 On exit *REF_CU is the CU of the result.
18418 Returns NULL if the referenced DIE isn't found. */
18420 static struct die_info *
18421 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
18422 struct dwarf2_cu **ref_cu)
18424 struct objfile *objfile = (*ref_cu)->objfile;
18425 struct die_info temp_die;
18426 struct dwarf2_cu *sig_cu;
18427 struct die_info *die;
18429 /* While it might be nice to assert sig_type->type == NULL here,
18430 we can get here for DW_AT_imported_declaration where we need
18431 the DIE not the type. */
18433 /* If necessary, add it to the queue and load its DIEs. */
18435 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
18436 read_signatured_type (sig_type);
18438 sig_cu = sig_type->per_cu.cu;
18439 gdb_assert (sig_cu != NULL);
18440 gdb_assert (sig_type->type_offset_in_section.sect_off != 0);
18441 temp_die.offset = sig_type->type_offset_in_section;
18442 die = htab_find_with_hash (sig_cu->die_hash, &temp_die,
18443 temp_die.offset.sect_off);
18446 /* For .gdb_index version 7 keep track of included TUs.
18447 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
18448 if (dwarf2_per_objfile->index_table != NULL
18449 && dwarf2_per_objfile->index_table->version <= 7)
18451 VEC_safe_push (dwarf2_per_cu_ptr,
18452 (*ref_cu)->per_cu->imported_symtabs,
18463 /* Follow signatured type referenced by ATTR in SRC_DIE.
18464 On entry *REF_CU is the CU of SRC_DIE.
18465 On exit *REF_CU is the CU of the result.
18466 The result is the DIE of the type.
18467 If the referenced type cannot be found an error is thrown. */
18469 static struct die_info *
18470 follow_die_sig (struct die_info *src_die, const struct attribute *attr,
18471 struct dwarf2_cu **ref_cu)
18473 ULONGEST signature = DW_SIGNATURE (attr);
18474 struct signatured_type *sig_type;
18475 struct die_info *die;
18477 gdb_assert (attr->form == DW_FORM_ref_sig8);
18479 sig_type = lookup_signatured_type (*ref_cu, signature);
18480 /* sig_type will be NULL if the signatured type is missing from
18482 if (sig_type == NULL)
18484 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
18485 " from DIE at 0x%x [in module %s]"),
18486 hex_string (signature), src_die->offset.sect_off,
18487 objfile_name ((*ref_cu)->objfile));
18490 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
18493 dump_die_for_error (src_die);
18494 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
18495 " from DIE at 0x%x [in module %s]"),
18496 hex_string (signature), src_die->offset.sect_off,
18497 objfile_name ((*ref_cu)->objfile));
18503 /* Get the type specified by SIGNATURE referenced in DIE/CU,
18504 reading in and processing the type unit if necessary. */
18506 static struct type *
18507 get_signatured_type (struct die_info *die, ULONGEST signature,
18508 struct dwarf2_cu *cu)
18510 struct signatured_type *sig_type;
18511 struct dwarf2_cu *type_cu;
18512 struct die_info *type_die;
18515 sig_type = lookup_signatured_type (cu, signature);
18516 /* sig_type will be NULL if the signatured type is missing from
18518 if (sig_type == NULL)
18520 complaint (&symfile_complaints,
18521 _("Dwarf Error: Cannot find signatured DIE %s referenced"
18522 " from DIE at 0x%x [in module %s]"),
18523 hex_string (signature), die->offset.sect_off,
18524 objfile_name (dwarf2_per_objfile->objfile));
18525 return build_error_marker_type (cu, die);
18528 /* If we already know the type we're done. */
18529 if (sig_type->type != NULL)
18530 return sig_type->type;
18533 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
18534 if (type_die != NULL)
18536 /* N.B. We need to call get_die_type to ensure only one type for this DIE
18537 is created. This is important, for example, because for c++ classes
18538 we need TYPE_NAME set which is only done by new_symbol. Blech. */
18539 type = read_type_die (type_die, type_cu);
18542 complaint (&symfile_complaints,
18543 _("Dwarf Error: Cannot build signatured type %s"
18544 " referenced from DIE at 0x%x [in module %s]"),
18545 hex_string (signature), die->offset.sect_off,
18546 objfile_name (dwarf2_per_objfile->objfile));
18547 type = build_error_marker_type (cu, die);
18552 complaint (&symfile_complaints,
18553 _("Dwarf Error: Problem reading signatured DIE %s referenced"
18554 " from DIE at 0x%x [in module %s]"),
18555 hex_string (signature), die->offset.sect_off,
18556 objfile_name (dwarf2_per_objfile->objfile));
18557 type = build_error_marker_type (cu, die);
18559 sig_type->type = type;
18564 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
18565 reading in and processing the type unit if necessary. */
18567 static struct type *
18568 get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr,
18569 struct dwarf2_cu *cu) /* ARI: editCase function */
18571 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
18572 if (attr_form_is_ref (attr))
18574 struct dwarf2_cu *type_cu = cu;
18575 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
18577 return read_type_die (type_die, type_cu);
18579 else if (attr->form == DW_FORM_ref_sig8)
18581 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
18585 complaint (&symfile_complaints,
18586 _("Dwarf Error: DW_AT_signature has bad form %s in DIE"
18587 " at 0x%x [in module %s]"),
18588 dwarf_form_name (attr->form), die->offset.sect_off,
18589 objfile_name (dwarf2_per_objfile->objfile));
18590 return build_error_marker_type (cu, die);
18594 /* Load the DIEs associated with type unit PER_CU into memory. */
18597 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
18599 struct signatured_type *sig_type;
18601 /* Caller is responsible for ensuring type_unit_groups don't get here. */
18602 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
18604 /* We have the per_cu, but we need the signatured_type.
18605 Fortunately this is an easy translation. */
18606 gdb_assert (per_cu->is_debug_types);
18607 sig_type = (struct signatured_type *) per_cu;
18609 gdb_assert (per_cu->cu == NULL);
18611 read_signatured_type (sig_type);
18613 gdb_assert (per_cu->cu != NULL);
18616 /* die_reader_func for read_signatured_type.
18617 This is identical to load_full_comp_unit_reader,
18618 but is kept separate for now. */
18621 read_signatured_type_reader (const struct die_reader_specs *reader,
18622 const gdb_byte *info_ptr,
18623 struct die_info *comp_unit_die,
18627 struct dwarf2_cu *cu = reader->cu;
18629 gdb_assert (cu->die_hash == NULL);
18631 htab_create_alloc_ex (cu->header.length / 12,
18635 &cu->comp_unit_obstack,
18636 hashtab_obstack_allocate,
18637 dummy_obstack_deallocate);
18640 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
18641 &info_ptr, comp_unit_die);
18642 cu->dies = comp_unit_die;
18643 /* comp_unit_die is not stored in die_hash, no need. */
18645 /* We try not to read any attributes in this function, because not
18646 all CUs needed for references have been loaded yet, and symbol
18647 table processing isn't initialized. But we have to set the CU language,
18648 or we won't be able to build types correctly.
18649 Similarly, if we do not read the producer, we can not apply
18650 producer-specific interpretation. */
18651 prepare_one_comp_unit (cu, cu->dies, language_minimal);
18654 /* Read in a signatured type and build its CU and DIEs.
18655 If the type is a stub for the real type in a DWO file,
18656 read in the real type from the DWO file as well. */
18659 read_signatured_type (struct signatured_type *sig_type)
18661 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
18663 gdb_assert (per_cu->is_debug_types);
18664 gdb_assert (per_cu->cu == NULL);
18666 init_cutu_and_read_dies (per_cu, NULL, 0, 1,
18667 read_signatured_type_reader, NULL);
18668 sig_type->per_cu.tu_read = 1;
18671 /* Decode simple location descriptions.
18672 Given a pointer to a dwarf block that defines a location, compute
18673 the location and return the value.
18675 NOTE drow/2003-11-18: This function is called in two situations
18676 now: for the address of static or global variables (partial symbols
18677 only) and for offsets into structures which are expected to be
18678 (more or less) constant. The partial symbol case should go away,
18679 and only the constant case should remain. That will let this
18680 function complain more accurately. A few special modes are allowed
18681 without complaint for global variables (for instance, global
18682 register values and thread-local values).
18684 A location description containing no operations indicates that the
18685 object is optimized out. The return value is 0 for that case.
18686 FIXME drow/2003-11-16: No callers check for this case any more; soon all
18687 callers will only want a very basic result and this can become a
18690 Note that stack[0] is unused except as a default error return. */
18693 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
18695 struct objfile *objfile = cu->objfile;
18697 size_t size = blk->size;
18698 const gdb_byte *data = blk->data;
18699 CORE_ADDR stack[64];
18701 unsigned int bytes_read, unsnd;
18707 stack[++stacki] = 0;
18746 stack[++stacki] = op - DW_OP_lit0;
18781 stack[++stacki] = op - DW_OP_reg0;
18783 dwarf2_complex_location_expr_complaint ();
18787 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
18789 stack[++stacki] = unsnd;
18791 dwarf2_complex_location_expr_complaint ();
18795 stack[++stacki] = read_address (objfile->obfd, &data[i],
18800 case DW_OP_const1u:
18801 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
18805 case DW_OP_const1s:
18806 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
18810 case DW_OP_const2u:
18811 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
18815 case DW_OP_const2s:
18816 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
18820 case DW_OP_const4u:
18821 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
18825 case DW_OP_const4s:
18826 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
18830 case DW_OP_const8u:
18831 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
18836 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
18842 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
18847 stack[stacki + 1] = stack[stacki];
18852 stack[stacki - 1] += stack[stacki];
18856 case DW_OP_plus_uconst:
18857 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
18863 stack[stacki - 1] -= stack[stacki];
18868 /* If we're not the last op, then we definitely can't encode
18869 this using GDB's address_class enum. This is valid for partial
18870 global symbols, although the variable's address will be bogus
18873 dwarf2_complex_location_expr_complaint ();
18876 case DW_OP_GNU_push_tls_address:
18877 /* The top of the stack has the offset from the beginning
18878 of the thread control block at which the variable is located. */
18879 /* Nothing should follow this operator, so the top of stack would
18881 /* This is valid for partial global symbols, but the variable's
18882 address will be bogus in the psymtab. Make it always at least
18883 non-zero to not look as a variable garbage collected by linker
18884 which have DW_OP_addr 0. */
18886 dwarf2_complex_location_expr_complaint ();
18890 case DW_OP_GNU_uninit:
18893 case DW_OP_GNU_addr_index:
18894 case DW_OP_GNU_const_index:
18895 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
18902 const char *name = get_DW_OP_name (op);
18905 complaint (&symfile_complaints, _("unsupported stack op: '%s'"),
18908 complaint (&symfile_complaints, _("unsupported stack op: '%02x'"),
18912 return (stack[stacki]);
18915 /* Enforce maximum stack depth of SIZE-1 to avoid writing
18916 outside of the allocated space. Also enforce minimum>0. */
18917 if (stacki >= ARRAY_SIZE (stack) - 1)
18919 complaint (&symfile_complaints,
18920 _("location description stack overflow"));
18926 complaint (&symfile_complaints,
18927 _("location description stack underflow"));
18931 return (stack[stacki]);
18934 /* memory allocation interface */
18936 static struct dwarf_block *
18937 dwarf_alloc_block (struct dwarf2_cu *cu)
18939 struct dwarf_block *blk;
18941 blk = (struct dwarf_block *)
18942 obstack_alloc (&cu->comp_unit_obstack, sizeof (struct dwarf_block));
18946 static struct die_info *
18947 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
18949 struct die_info *die;
18950 size_t size = sizeof (struct die_info);
18953 size += (num_attrs - 1) * sizeof (struct attribute);
18955 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
18956 memset (die, 0, sizeof (struct die_info));
18961 /* Macro support. */
18963 /* Return file name relative to the compilation directory of file number I in
18964 *LH's file name table. The result is allocated using xmalloc; the caller is
18965 responsible for freeing it. */
18968 file_file_name (int file, struct line_header *lh)
18970 /* Is the file number a valid index into the line header's file name
18971 table? Remember that file numbers start with one, not zero. */
18972 if (1 <= file && file <= lh->num_file_names)
18974 struct file_entry *fe = &lh->file_names[file - 1];
18976 if (IS_ABSOLUTE_PATH (fe->name) || fe->dir_index == 0)
18977 return xstrdup (fe->name);
18978 return concat (lh->include_dirs[fe->dir_index - 1], SLASH_STRING,
18983 /* The compiler produced a bogus file number. We can at least
18984 record the macro definitions made in the file, even if we
18985 won't be able to find the file by name. */
18986 char fake_name[80];
18988 xsnprintf (fake_name, sizeof (fake_name),
18989 "<bad macro file number %d>", file);
18991 complaint (&symfile_complaints,
18992 _("bad file number in macro information (%d)"),
18995 return xstrdup (fake_name);
18999 /* Return the full name of file number I in *LH's file name table.
19000 Use COMP_DIR as the name of the current directory of the
19001 compilation. The result is allocated using xmalloc; the caller is
19002 responsible for freeing it. */
19004 file_full_name (int file, struct line_header *lh, const char *comp_dir)
19006 /* Is the file number a valid index into the line header's file name
19007 table? Remember that file numbers start with one, not zero. */
19008 if (1 <= file && file <= lh->num_file_names)
19010 char *relative = file_file_name (file, lh);
19012 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
19014 return reconcat (relative, comp_dir, SLASH_STRING, relative, NULL);
19017 return file_file_name (file, lh);
19021 static struct macro_source_file *
19022 macro_start_file (int file, int line,
19023 struct macro_source_file *current_file,
19024 const char *comp_dir,
19025 struct line_header *lh, struct objfile *objfile)
19027 /* File name relative to the compilation directory of this source file. */
19028 char *file_name = file_file_name (file, lh);
19030 if (! current_file)
19032 /* Note: We don't create a macro table for this compilation unit
19033 at all until we actually get a filename. */
19034 struct macro_table *macro_table = get_macro_table (objfile, comp_dir);
19036 /* If we have no current file, then this must be the start_file
19037 directive for the compilation unit's main source file. */
19038 current_file = macro_set_main (macro_table, file_name);
19039 macro_define_special (macro_table);
19042 current_file = macro_include (current_file, line, file_name);
19046 return current_file;
19050 /* Copy the LEN characters at BUF to a xmalloc'ed block of memory,
19051 followed by a null byte. */
19053 copy_string (const char *buf, int len)
19055 char *s = xmalloc (len + 1);
19057 memcpy (s, buf, len);
19063 static const char *
19064 consume_improper_spaces (const char *p, const char *body)
19068 complaint (&symfile_complaints,
19069 _("macro definition contains spaces "
19070 "in formal argument list:\n`%s'"),
19082 parse_macro_definition (struct macro_source_file *file, int line,
19087 /* The body string takes one of two forms. For object-like macro
19088 definitions, it should be:
19090 <macro name> " " <definition>
19092 For function-like macro definitions, it should be:
19094 <macro name> "() " <definition>
19096 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
19098 Spaces may appear only where explicitly indicated, and in the
19101 The Dwarf 2 spec says that an object-like macro's name is always
19102 followed by a space, but versions of GCC around March 2002 omit
19103 the space when the macro's definition is the empty string.
19105 The Dwarf 2 spec says that there should be no spaces between the
19106 formal arguments in a function-like macro's formal argument list,
19107 but versions of GCC around March 2002 include spaces after the
19111 /* Find the extent of the macro name. The macro name is terminated
19112 by either a space or null character (for an object-like macro) or
19113 an opening paren (for a function-like macro). */
19114 for (p = body; *p; p++)
19115 if (*p == ' ' || *p == '(')
19118 if (*p == ' ' || *p == '\0')
19120 /* It's an object-like macro. */
19121 int name_len = p - body;
19122 char *name = copy_string (body, name_len);
19123 const char *replacement;
19126 replacement = body + name_len + 1;
19129 dwarf2_macro_malformed_definition_complaint (body);
19130 replacement = body + name_len;
19133 macro_define_object (file, line, name, replacement);
19137 else if (*p == '(')
19139 /* It's a function-like macro. */
19140 char *name = copy_string (body, p - body);
19143 char **argv = xmalloc (argv_size * sizeof (*argv));
19147 p = consume_improper_spaces (p, body);
19149 /* Parse the formal argument list. */
19150 while (*p && *p != ')')
19152 /* Find the extent of the current argument name. */
19153 const char *arg_start = p;
19155 while (*p && *p != ',' && *p != ')' && *p != ' ')
19158 if (! *p || p == arg_start)
19159 dwarf2_macro_malformed_definition_complaint (body);
19162 /* Make sure argv has room for the new argument. */
19163 if (argc >= argv_size)
19166 argv = xrealloc (argv, argv_size * sizeof (*argv));
19169 argv[argc++] = copy_string (arg_start, p - arg_start);
19172 p = consume_improper_spaces (p, body);
19174 /* Consume the comma, if present. */
19179 p = consume_improper_spaces (p, body);
19188 /* Perfectly formed definition, no complaints. */
19189 macro_define_function (file, line, name,
19190 argc, (const char **) argv,
19192 else if (*p == '\0')
19194 /* Complain, but do define it. */
19195 dwarf2_macro_malformed_definition_complaint (body);
19196 macro_define_function (file, line, name,
19197 argc, (const char **) argv,
19201 /* Just complain. */
19202 dwarf2_macro_malformed_definition_complaint (body);
19205 /* Just complain. */
19206 dwarf2_macro_malformed_definition_complaint (body);
19212 for (i = 0; i < argc; i++)
19218 dwarf2_macro_malformed_definition_complaint (body);
19221 /* Skip some bytes from BYTES according to the form given in FORM.
19222 Returns the new pointer. */
19224 static const gdb_byte *
19225 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
19226 enum dwarf_form form,
19227 unsigned int offset_size,
19228 struct dwarf2_section_info *section)
19230 unsigned int bytes_read;
19234 case DW_FORM_data1:
19239 case DW_FORM_data2:
19243 case DW_FORM_data4:
19247 case DW_FORM_data8:
19251 case DW_FORM_string:
19252 read_direct_string (abfd, bytes, &bytes_read);
19253 bytes += bytes_read;
19256 case DW_FORM_sec_offset:
19258 case DW_FORM_GNU_strp_alt:
19259 bytes += offset_size;
19262 case DW_FORM_block:
19263 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
19264 bytes += bytes_read;
19267 case DW_FORM_block1:
19268 bytes += 1 + read_1_byte (abfd, bytes);
19270 case DW_FORM_block2:
19271 bytes += 2 + read_2_bytes (abfd, bytes);
19273 case DW_FORM_block4:
19274 bytes += 4 + read_4_bytes (abfd, bytes);
19277 case DW_FORM_sdata:
19278 case DW_FORM_udata:
19279 case DW_FORM_GNU_addr_index:
19280 case DW_FORM_GNU_str_index:
19281 bytes = gdb_skip_leb128 (bytes, buffer_end);
19284 dwarf2_section_buffer_overflow_complaint (section);
19292 complaint (&symfile_complaints,
19293 _("invalid form 0x%x in `%s'"),
19295 section->asection->name);
19303 /* A helper for dwarf_decode_macros that handles skipping an unknown
19304 opcode. Returns an updated pointer to the macro data buffer; or,
19305 on error, issues a complaint and returns NULL. */
19307 static const gdb_byte *
19308 skip_unknown_opcode (unsigned int opcode,
19309 const gdb_byte **opcode_definitions,
19310 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
19312 unsigned int offset_size,
19313 struct dwarf2_section_info *section)
19315 unsigned int bytes_read, i;
19317 const gdb_byte *defn;
19319 if (opcode_definitions[opcode] == NULL)
19321 complaint (&symfile_complaints,
19322 _("unrecognized DW_MACFINO opcode 0x%x"),
19327 defn = opcode_definitions[opcode];
19328 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
19329 defn += bytes_read;
19331 for (i = 0; i < arg; ++i)
19333 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end, defn[i], offset_size,
19335 if (mac_ptr == NULL)
19337 /* skip_form_bytes already issued the complaint. */
19345 /* A helper function which parses the header of a macro section.
19346 If the macro section is the extended (for now called "GNU") type,
19347 then this updates *OFFSET_SIZE. Returns a pointer to just after
19348 the header, or issues a complaint and returns NULL on error. */
19350 static const gdb_byte *
19351 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
19353 const gdb_byte *mac_ptr,
19354 unsigned int *offset_size,
19355 int section_is_gnu)
19357 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
19359 if (section_is_gnu)
19361 unsigned int version, flags;
19363 version = read_2_bytes (abfd, mac_ptr);
19366 complaint (&symfile_complaints,
19367 _("unrecognized version `%d' in .debug_macro section"),
19373 flags = read_1_byte (abfd, mac_ptr);
19375 *offset_size = (flags & 1) ? 8 : 4;
19377 if ((flags & 2) != 0)
19378 /* We don't need the line table offset. */
19379 mac_ptr += *offset_size;
19381 /* Vendor opcode descriptions. */
19382 if ((flags & 4) != 0)
19384 unsigned int i, count;
19386 count = read_1_byte (abfd, mac_ptr);
19388 for (i = 0; i < count; ++i)
19390 unsigned int opcode, bytes_read;
19393 opcode = read_1_byte (abfd, mac_ptr);
19395 opcode_definitions[opcode] = mac_ptr;
19396 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19397 mac_ptr += bytes_read;
19406 /* A helper for dwarf_decode_macros that handles the GNU extensions,
19407 including DW_MACRO_GNU_transparent_include. */
19410 dwarf_decode_macro_bytes (bfd *abfd,
19411 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
19412 struct macro_source_file *current_file,
19413 struct line_header *lh, const char *comp_dir,
19414 struct dwarf2_section_info *section,
19415 int section_is_gnu, int section_is_dwz,
19416 unsigned int offset_size,
19417 struct objfile *objfile,
19418 htab_t include_hash)
19420 enum dwarf_macro_record_type macinfo_type;
19421 int at_commandline;
19422 const gdb_byte *opcode_definitions[256];
19424 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
19425 &offset_size, section_is_gnu);
19426 if (mac_ptr == NULL)
19428 /* We already issued a complaint. */
19432 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
19433 GDB is still reading the definitions from command line. First
19434 DW_MACINFO_start_file will need to be ignored as it was already executed
19435 to create CURRENT_FILE for the main source holding also the command line
19436 definitions. On first met DW_MACINFO_start_file this flag is reset to
19437 normally execute all the remaining DW_MACINFO_start_file macinfos. */
19439 at_commandline = 1;
19443 /* Do we at least have room for a macinfo type byte? */
19444 if (mac_ptr >= mac_end)
19446 dwarf2_section_buffer_overflow_complaint (section);
19450 macinfo_type = read_1_byte (abfd, mac_ptr);
19453 /* Note that we rely on the fact that the corresponding GNU and
19454 DWARF constants are the same. */
19455 switch (macinfo_type)
19457 /* A zero macinfo type indicates the end of the macro
19462 case DW_MACRO_GNU_define:
19463 case DW_MACRO_GNU_undef:
19464 case DW_MACRO_GNU_define_indirect:
19465 case DW_MACRO_GNU_undef_indirect:
19466 case DW_MACRO_GNU_define_indirect_alt:
19467 case DW_MACRO_GNU_undef_indirect_alt:
19469 unsigned int bytes_read;
19474 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19475 mac_ptr += bytes_read;
19477 if (macinfo_type == DW_MACRO_GNU_define
19478 || macinfo_type == DW_MACRO_GNU_undef)
19480 body = read_direct_string (abfd, mac_ptr, &bytes_read);
19481 mac_ptr += bytes_read;
19485 LONGEST str_offset;
19487 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
19488 mac_ptr += offset_size;
19490 if (macinfo_type == DW_MACRO_GNU_define_indirect_alt
19491 || macinfo_type == DW_MACRO_GNU_undef_indirect_alt
19494 struct dwz_file *dwz = dwarf2_get_dwz_file ();
19496 body = read_indirect_string_from_dwz (dwz, str_offset);
19499 body = read_indirect_string_at_offset (abfd, str_offset);
19502 is_define = (macinfo_type == DW_MACRO_GNU_define
19503 || macinfo_type == DW_MACRO_GNU_define_indirect
19504 || macinfo_type == DW_MACRO_GNU_define_indirect_alt);
19505 if (! current_file)
19507 /* DWARF violation as no main source is present. */
19508 complaint (&symfile_complaints,
19509 _("debug info with no main source gives macro %s "
19511 is_define ? _("definition") : _("undefinition"),
19515 if ((line == 0 && !at_commandline)
19516 || (line != 0 && at_commandline))
19517 complaint (&symfile_complaints,
19518 _("debug info gives %s macro %s with %s line %d: %s"),
19519 at_commandline ? _("command-line") : _("in-file"),
19520 is_define ? _("definition") : _("undefinition"),
19521 line == 0 ? _("zero") : _("non-zero"), line, body);
19524 parse_macro_definition (current_file, line, body);
19527 gdb_assert (macinfo_type == DW_MACRO_GNU_undef
19528 || macinfo_type == DW_MACRO_GNU_undef_indirect
19529 || macinfo_type == DW_MACRO_GNU_undef_indirect_alt);
19530 macro_undef (current_file, line, body);
19535 case DW_MACRO_GNU_start_file:
19537 unsigned int bytes_read;
19540 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19541 mac_ptr += bytes_read;
19542 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19543 mac_ptr += bytes_read;
19545 if ((line == 0 && !at_commandline)
19546 || (line != 0 && at_commandline))
19547 complaint (&symfile_complaints,
19548 _("debug info gives source %d included "
19549 "from %s at %s line %d"),
19550 file, at_commandline ? _("command-line") : _("file"),
19551 line == 0 ? _("zero") : _("non-zero"), line);
19553 if (at_commandline)
19555 /* This DW_MACRO_GNU_start_file was executed in the
19557 at_commandline = 0;
19560 current_file = macro_start_file (file, line,
19561 current_file, comp_dir,
19566 case DW_MACRO_GNU_end_file:
19567 if (! current_file)
19568 complaint (&symfile_complaints,
19569 _("macro debug info has an unmatched "
19570 "`close_file' directive"));
19573 current_file = current_file->included_by;
19574 if (! current_file)
19576 enum dwarf_macro_record_type next_type;
19578 /* GCC circa March 2002 doesn't produce the zero
19579 type byte marking the end of the compilation
19580 unit. Complain if it's not there, but exit no
19583 /* Do we at least have room for a macinfo type byte? */
19584 if (mac_ptr >= mac_end)
19586 dwarf2_section_buffer_overflow_complaint (section);
19590 /* We don't increment mac_ptr here, so this is just
19592 next_type = read_1_byte (abfd, mac_ptr);
19593 if (next_type != 0)
19594 complaint (&symfile_complaints,
19595 _("no terminating 0-type entry for "
19596 "macros in `.debug_macinfo' section"));
19603 case DW_MACRO_GNU_transparent_include:
19604 case DW_MACRO_GNU_transparent_include_alt:
19608 bfd *include_bfd = abfd;
19609 struct dwarf2_section_info *include_section = section;
19610 struct dwarf2_section_info alt_section;
19611 const gdb_byte *include_mac_end = mac_end;
19612 int is_dwz = section_is_dwz;
19613 const gdb_byte *new_mac_ptr;
19615 offset = read_offset_1 (abfd, mac_ptr, offset_size);
19616 mac_ptr += offset_size;
19618 if (macinfo_type == DW_MACRO_GNU_transparent_include_alt)
19620 struct dwz_file *dwz = dwarf2_get_dwz_file ();
19622 dwarf2_read_section (dwarf2_per_objfile->objfile,
19625 include_bfd = dwz->macro.asection->owner;
19626 include_section = &dwz->macro;
19627 include_mac_end = dwz->macro.buffer + dwz->macro.size;
19631 new_mac_ptr = include_section->buffer + offset;
19632 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
19636 /* This has actually happened; see
19637 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
19638 complaint (&symfile_complaints,
19639 _("recursive DW_MACRO_GNU_transparent_include in "
19640 ".debug_macro section"));
19644 *slot = (void *) new_mac_ptr;
19646 dwarf_decode_macro_bytes (include_bfd, new_mac_ptr,
19647 include_mac_end, current_file,
19649 section, section_is_gnu, is_dwz,
19650 offset_size, objfile, include_hash);
19652 htab_remove_elt (include_hash, (void *) new_mac_ptr);
19657 case DW_MACINFO_vendor_ext:
19658 if (!section_is_gnu)
19660 unsigned int bytes_read;
19663 constant = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19664 mac_ptr += bytes_read;
19665 read_direct_string (abfd, mac_ptr, &bytes_read);
19666 mac_ptr += bytes_read;
19668 /* We don't recognize any vendor extensions. */
19674 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
19675 mac_ptr, mac_end, abfd, offset_size,
19677 if (mac_ptr == NULL)
19681 } while (macinfo_type != 0);
19685 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
19686 const char *comp_dir, int section_is_gnu)
19688 struct objfile *objfile = dwarf2_per_objfile->objfile;
19689 struct line_header *lh = cu->line_header;
19691 const gdb_byte *mac_ptr, *mac_end;
19692 struct macro_source_file *current_file = 0;
19693 enum dwarf_macro_record_type macinfo_type;
19694 unsigned int offset_size = cu->header.offset_size;
19695 const gdb_byte *opcode_definitions[256];
19696 struct cleanup *cleanup;
19697 htab_t include_hash;
19699 struct dwarf2_section_info *section;
19700 const char *section_name;
19702 if (cu->dwo_unit != NULL)
19704 if (section_is_gnu)
19706 section = &cu->dwo_unit->dwo_file->sections.macro;
19707 section_name = ".debug_macro.dwo";
19711 section = &cu->dwo_unit->dwo_file->sections.macinfo;
19712 section_name = ".debug_macinfo.dwo";
19717 if (section_is_gnu)
19719 section = &dwarf2_per_objfile->macro;
19720 section_name = ".debug_macro";
19724 section = &dwarf2_per_objfile->macinfo;
19725 section_name = ".debug_macinfo";
19729 dwarf2_read_section (objfile, section);
19730 if (section->buffer == NULL)
19732 complaint (&symfile_complaints, _("missing %s section"), section_name);
19735 abfd = section->asection->owner;
19737 /* First pass: Find the name of the base filename.
19738 This filename is needed in order to process all macros whose definition
19739 (or undefinition) comes from the command line. These macros are defined
19740 before the first DW_MACINFO_start_file entry, and yet still need to be
19741 associated to the base file.
19743 To determine the base file name, we scan the macro definitions until we
19744 reach the first DW_MACINFO_start_file entry. We then initialize
19745 CURRENT_FILE accordingly so that any macro definition found before the
19746 first DW_MACINFO_start_file can still be associated to the base file. */
19748 mac_ptr = section->buffer + offset;
19749 mac_end = section->buffer + section->size;
19751 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
19752 &offset_size, section_is_gnu);
19753 if (mac_ptr == NULL)
19755 /* We already issued a complaint. */
19761 /* Do we at least have room for a macinfo type byte? */
19762 if (mac_ptr >= mac_end)
19764 /* Complaint is printed during the second pass as GDB will probably
19765 stop the first pass earlier upon finding
19766 DW_MACINFO_start_file. */
19770 macinfo_type = read_1_byte (abfd, mac_ptr);
19773 /* Note that we rely on the fact that the corresponding GNU and
19774 DWARF constants are the same. */
19775 switch (macinfo_type)
19777 /* A zero macinfo type indicates the end of the macro
19782 case DW_MACRO_GNU_define:
19783 case DW_MACRO_GNU_undef:
19784 /* Only skip the data by MAC_PTR. */
19786 unsigned int bytes_read;
19788 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19789 mac_ptr += bytes_read;
19790 read_direct_string (abfd, mac_ptr, &bytes_read);
19791 mac_ptr += bytes_read;
19795 case DW_MACRO_GNU_start_file:
19797 unsigned int bytes_read;
19800 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19801 mac_ptr += bytes_read;
19802 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19803 mac_ptr += bytes_read;
19805 current_file = macro_start_file (file, line, current_file,
19806 comp_dir, lh, objfile);
19810 case DW_MACRO_GNU_end_file:
19811 /* No data to skip by MAC_PTR. */
19814 case DW_MACRO_GNU_define_indirect:
19815 case DW_MACRO_GNU_undef_indirect:
19816 case DW_MACRO_GNU_define_indirect_alt:
19817 case DW_MACRO_GNU_undef_indirect_alt:
19819 unsigned int bytes_read;
19821 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19822 mac_ptr += bytes_read;
19823 mac_ptr += offset_size;
19827 case DW_MACRO_GNU_transparent_include:
19828 case DW_MACRO_GNU_transparent_include_alt:
19829 /* Note that, according to the spec, a transparent include
19830 chain cannot call DW_MACRO_GNU_start_file. So, we can just
19831 skip this opcode. */
19832 mac_ptr += offset_size;
19835 case DW_MACINFO_vendor_ext:
19836 /* Only skip the data by MAC_PTR. */
19837 if (!section_is_gnu)
19839 unsigned int bytes_read;
19841 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
19842 mac_ptr += bytes_read;
19843 read_direct_string (abfd, mac_ptr, &bytes_read);
19844 mac_ptr += bytes_read;
19849 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
19850 mac_ptr, mac_end, abfd, offset_size,
19852 if (mac_ptr == NULL)
19856 } while (macinfo_type != 0 && current_file == NULL);
19858 /* Second pass: Process all entries.
19860 Use the AT_COMMAND_LINE flag to determine whether we are still processing
19861 command-line macro definitions/undefinitions. This flag is unset when we
19862 reach the first DW_MACINFO_start_file entry. */
19864 include_hash = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
19865 NULL, xcalloc, xfree);
19866 cleanup = make_cleanup_htab_delete (include_hash);
19867 mac_ptr = section->buffer + offset;
19868 slot = htab_find_slot (include_hash, mac_ptr, INSERT);
19869 *slot = (void *) mac_ptr;
19870 dwarf_decode_macro_bytes (abfd, mac_ptr, mac_end,
19871 current_file, lh, comp_dir, section,
19873 offset_size, objfile, include_hash);
19874 do_cleanups (cleanup);
19877 /* Check if the attribute's form is a DW_FORM_block*
19878 if so return true else false. */
19881 attr_form_is_block (const struct attribute *attr)
19883 return (attr == NULL ? 0 :
19884 attr->form == DW_FORM_block1
19885 || attr->form == DW_FORM_block2
19886 || attr->form == DW_FORM_block4
19887 || attr->form == DW_FORM_block
19888 || attr->form == DW_FORM_exprloc);
19891 /* Return non-zero if ATTR's value is a section offset --- classes
19892 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
19893 You may use DW_UNSND (attr) to retrieve such offsets.
19895 Section 7.5.4, "Attribute Encodings", explains that no attribute
19896 may have a value that belongs to more than one of these classes; it
19897 would be ambiguous if we did, because we use the same forms for all
19901 attr_form_is_section_offset (const struct attribute *attr)
19903 return (attr->form == DW_FORM_data4
19904 || attr->form == DW_FORM_data8
19905 || attr->form == DW_FORM_sec_offset);
19908 /* Return non-zero if ATTR's value falls in the 'constant' class, or
19909 zero otherwise. When this function returns true, you can apply
19910 dwarf2_get_attr_constant_value to it.
19912 However, note that for some attributes you must check
19913 attr_form_is_section_offset before using this test. DW_FORM_data4
19914 and DW_FORM_data8 are members of both the constant class, and of
19915 the classes that contain offsets into other debug sections
19916 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
19917 that, if an attribute's can be either a constant or one of the
19918 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
19919 taken as section offsets, not constants. */
19922 attr_form_is_constant (const struct attribute *attr)
19924 switch (attr->form)
19926 case DW_FORM_sdata:
19927 case DW_FORM_udata:
19928 case DW_FORM_data1:
19929 case DW_FORM_data2:
19930 case DW_FORM_data4:
19931 case DW_FORM_data8:
19939 /* DW_ADDR is always stored already as sect_offset; despite for the forms
19940 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
19943 attr_form_is_ref (const struct attribute *attr)
19945 switch (attr->form)
19947 case DW_FORM_ref_addr:
19952 case DW_FORM_ref_udata:
19953 case DW_FORM_GNU_ref_alt:
19960 /* Return the .debug_loc section to use for CU.
19961 For DWO files use .debug_loc.dwo. */
19963 static struct dwarf2_section_info *
19964 cu_debug_loc_section (struct dwarf2_cu *cu)
19967 return &cu->dwo_unit->dwo_file->sections.loc;
19968 return &dwarf2_per_objfile->loc;
19971 /* A helper function that fills in a dwarf2_loclist_baton. */
19974 fill_in_loclist_baton (struct dwarf2_cu *cu,
19975 struct dwarf2_loclist_baton *baton,
19976 const struct attribute *attr)
19978 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
19980 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
19982 baton->per_cu = cu->per_cu;
19983 gdb_assert (baton->per_cu);
19984 /* We don't know how long the location list is, but make sure we
19985 don't run off the edge of the section. */
19986 baton->size = section->size - DW_UNSND (attr);
19987 baton->data = section->buffer + DW_UNSND (attr);
19988 baton->base_address = cu->base_address;
19989 baton->from_dwo = cu->dwo_unit != NULL;
19993 dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym,
19994 struct dwarf2_cu *cu, int is_block)
19996 struct objfile *objfile = dwarf2_per_objfile->objfile;
19997 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
19999 if (attr_form_is_section_offset (attr)
20000 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
20001 the section. If so, fall through to the complaint in the
20003 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
20005 struct dwarf2_loclist_baton *baton;
20007 baton = obstack_alloc (&objfile->objfile_obstack,
20008 sizeof (struct dwarf2_loclist_baton));
20010 fill_in_loclist_baton (cu, baton, attr);
20012 if (cu->base_known == 0)
20013 complaint (&symfile_complaints,
20014 _("Location list used without "
20015 "specifying the CU base address."));
20017 SYMBOL_ACLASS_INDEX (sym) = (is_block
20018 ? dwarf2_loclist_block_index
20019 : dwarf2_loclist_index);
20020 SYMBOL_LOCATION_BATON (sym) = baton;
20024 struct dwarf2_locexpr_baton *baton;
20026 baton = obstack_alloc (&objfile->objfile_obstack,
20027 sizeof (struct dwarf2_locexpr_baton));
20028 baton->per_cu = cu->per_cu;
20029 gdb_assert (baton->per_cu);
20031 if (attr_form_is_block (attr))
20033 /* Note that we're just copying the block's data pointer
20034 here, not the actual data. We're still pointing into the
20035 info_buffer for SYM's objfile; right now we never release
20036 that buffer, but when we do clean up properly this may
20038 baton->size = DW_BLOCK (attr)->size;
20039 baton->data = DW_BLOCK (attr)->data;
20043 dwarf2_invalid_attrib_class_complaint ("location description",
20044 SYMBOL_NATURAL_NAME (sym));
20048 SYMBOL_ACLASS_INDEX (sym) = (is_block
20049 ? dwarf2_locexpr_block_index
20050 : dwarf2_locexpr_index);
20051 SYMBOL_LOCATION_BATON (sym) = baton;
20055 /* Return the OBJFILE associated with the compilation unit CU. If CU
20056 came from a separate debuginfo file, then the master objfile is
20060 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
20062 struct objfile *objfile = per_cu->objfile;
20064 /* Return the master objfile, so that we can report and look up the
20065 correct file containing this variable. */
20066 if (objfile->separate_debug_objfile_backlink)
20067 objfile = objfile->separate_debug_objfile_backlink;
20072 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
20073 (CU_HEADERP is unused in such case) or prepare a temporary copy at
20074 CU_HEADERP first. */
20076 static const struct comp_unit_head *
20077 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
20078 struct dwarf2_per_cu_data *per_cu)
20080 const gdb_byte *info_ptr;
20083 return &per_cu->cu->header;
20085 info_ptr = per_cu->section->buffer + per_cu->offset.sect_off;
20087 memset (cu_headerp, 0, sizeof (*cu_headerp));
20088 read_comp_unit_head (cu_headerp, info_ptr, per_cu->objfile->obfd);
20093 /* Return the address size given in the compilation unit header for CU. */
20096 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
20098 struct comp_unit_head cu_header_local;
20099 const struct comp_unit_head *cu_headerp;
20101 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
20103 return cu_headerp->addr_size;
20106 /* Return the offset size given in the compilation unit header for CU. */
20109 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
20111 struct comp_unit_head cu_header_local;
20112 const struct comp_unit_head *cu_headerp;
20114 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
20116 return cu_headerp->offset_size;
20119 /* See its dwarf2loc.h declaration. */
20122 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
20124 struct comp_unit_head cu_header_local;
20125 const struct comp_unit_head *cu_headerp;
20127 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
20129 if (cu_headerp->version == 2)
20130 return cu_headerp->addr_size;
20132 return cu_headerp->offset_size;
20135 /* Return the text offset of the CU. The returned offset comes from
20136 this CU's objfile. If this objfile came from a separate debuginfo
20137 file, then the offset may be different from the corresponding
20138 offset in the parent objfile. */
20141 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
20143 struct objfile *objfile = per_cu->objfile;
20145 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
20148 /* Locate the .debug_info compilation unit from CU's objfile which contains
20149 the DIE at OFFSET. Raises an error on failure. */
20151 static struct dwarf2_per_cu_data *
20152 dwarf2_find_containing_comp_unit (sect_offset offset,
20153 unsigned int offset_in_dwz,
20154 struct objfile *objfile)
20156 struct dwarf2_per_cu_data *this_cu;
20158 const sect_offset *cu_off;
20161 high = dwarf2_per_objfile->n_comp_units - 1;
20164 struct dwarf2_per_cu_data *mid_cu;
20165 int mid = low + (high - low) / 2;
20167 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
20168 cu_off = &mid_cu->offset;
20169 if (mid_cu->is_dwz > offset_in_dwz
20170 || (mid_cu->is_dwz == offset_in_dwz
20171 && cu_off->sect_off >= offset.sect_off))
20176 gdb_assert (low == high);
20177 this_cu = dwarf2_per_objfile->all_comp_units[low];
20178 cu_off = &this_cu->offset;
20179 if (this_cu->is_dwz != offset_in_dwz || cu_off->sect_off > offset.sect_off)
20181 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
20182 error (_("Dwarf Error: could not find partial DIE containing "
20183 "offset 0x%lx [in module %s]"),
20184 (long) offset.sect_off, bfd_get_filename (objfile->obfd));
20186 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->offset.sect_off
20187 <= offset.sect_off);
20188 return dwarf2_per_objfile->all_comp_units[low-1];
20192 this_cu = dwarf2_per_objfile->all_comp_units[low];
20193 if (low == dwarf2_per_objfile->n_comp_units - 1
20194 && offset.sect_off >= this_cu->offset.sect_off + this_cu->length)
20195 error (_("invalid dwarf2 offset %u"), offset.sect_off);
20196 gdb_assert (offset.sect_off < this_cu->offset.sect_off + this_cu->length);
20201 /* Initialize dwarf2_cu CU, owned by PER_CU. */
20204 init_one_comp_unit (struct dwarf2_cu *cu, struct dwarf2_per_cu_data *per_cu)
20206 memset (cu, 0, sizeof (*cu));
20208 cu->per_cu = per_cu;
20209 cu->objfile = per_cu->objfile;
20210 obstack_init (&cu->comp_unit_obstack);
20213 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
20216 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
20217 enum language pretend_language)
20219 struct attribute *attr;
20221 /* Set the language we're debugging. */
20222 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
20224 set_cu_language (DW_UNSND (attr), cu);
20227 cu->language = pretend_language;
20228 cu->language_defn = language_def (cu->language);
20231 attr = dwarf2_attr (comp_unit_die, DW_AT_producer, cu);
20233 cu->producer = DW_STRING (attr);
20236 /* Release one cached compilation unit, CU. We unlink it from the tree
20237 of compilation units, but we don't remove it from the read_in_chain;
20238 the caller is responsible for that.
20239 NOTE: DATA is a void * because this function is also used as a
20240 cleanup routine. */
20243 free_heap_comp_unit (void *data)
20245 struct dwarf2_cu *cu = data;
20247 gdb_assert (cu->per_cu != NULL);
20248 cu->per_cu->cu = NULL;
20251 obstack_free (&cu->comp_unit_obstack, NULL);
20256 /* This cleanup function is passed the address of a dwarf2_cu on the stack
20257 when we're finished with it. We can't free the pointer itself, but be
20258 sure to unlink it from the cache. Also release any associated storage. */
20261 free_stack_comp_unit (void *data)
20263 struct dwarf2_cu *cu = data;
20265 gdb_assert (cu->per_cu != NULL);
20266 cu->per_cu->cu = NULL;
20269 obstack_free (&cu->comp_unit_obstack, NULL);
20270 cu->partial_dies = NULL;
20273 /* Free all cached compilation units. */
20276 free_cached_comp_units (void *data)
20278 struct dwarf2_per_cu_data *per_cu, **last_chain;
20280 per_cu = dwarf2_per_objfile->read_in_chain;
20281 last_chain = &dwarf2_per_objfile->read_in_chain;
20282 while (per_cu != NULL)
20284 struct dwarf2_per_cu_data *next_cu;
20286 next_cu = per_cu->cu->read_in_chain;
20288 free_heap_comp_unit (per_cu->cu);
20289 *last_chain = next_cu;
20295 /* Increase the age counter on each cached compilation unit, and free
20296 any that are too old. */
20299 age_cached_comp_units (void)
20301 struct dwarf2_per_cu_data *per_cu, **last_chain;
20303 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
20304 per_cu = dwarf2_per_objfile->read_in_chain;
20305 while (per_cu != NULL)
20307 per_cu->cu->last_used ++;
20308 if (per_cu->cu->last_used <= dwarf2_max_cache_age)
20309 dwarf2_mark (per_cu->cu);
20310 per_cu = per_cu->cu->read_in_chain;
20313 per_cu = dwarf2_per_objfile->read_in_chain;
20314 last_chain = &dwarf2_per_objfile->read_in_chain;
20315 while (per_cu != NULL)
20317 struct dwarf2_per_cu_data *next_cu;
20319 next_cu = per_cu->cu->read_in_chain;
20321 if (!per_cu->cu->mark)
20323 free_heap_comp_unit (per_cu->cu);
20324 *last_chain = next_cu;
20327 last_chain = &per_cu->cu->read_in_chain;
20333 /* Remove a single compilation unit from the cache. */
20336 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
20338 struct dwarf2_per_cu_data *per_cu, **last_chain;
20340 per_cu = dwarf2_per_objfile->read_in_chain;
20341 last_chain = &dwarf2_per_objfile->read_in_chain;
20342 while (per_cu != NULL)
20344 struct dwarf2_per_cu_data *next_cu;
20346 next_cu = per_cu->cu->read_in_chain;
20348 if (per_cu == target_per_cu)
20350 free_heap_comp_unit (per_cu->cu);
20352 *last_chain = next_cu;
20356 last_chain = &per_cu->cu->read_in_chain;
20362 /* Release all extra memory associated with OBJFILE. */
20365 dwarf2_free_objfile (struct objfile *objfile)
20367 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
20369 if (dwarf2_per_objfile == NULL)
20372 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
20373 free_cached_comp_units (NULL);
20375 if (dwarf2_per_objfile->quick_file_names_table)
20376 htab_delete (dwarf2_per_objfile->quick_file_names_table);
20378 /* Everything else should be on the objfile obstack. */
20381 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
20382 We store these in a hash table separate from the DIEs, and preserve them
20383 when the DIEs are flushed out of cache.
20385 The CU "per_cu" pointer is needed because offset alone is not enough to
20386 uniquely identify the type. A file may have multiple .debug_types sections,
20387 or the type may come from a DWO file. Furthermore, while it's more logical
20388 to use per_cu->section+offset, with Fission the section with the data is in
20389 the DWO file but we don't know that section at the point we need it.
20390 We have to use something in dwarf2_per_cu_data (or the pointer to it)
20391 because we can enter the lookup routine, get_die_type_at_offset, from
20392 outside this file, and thus won't necessarily have PER_CU->cu.
20393 Fortunately, PER_CU is stable for the life of the objfile. */
20395 struct dwarf2_per_cu_offset_and_type
20397 const struct dwarf2_per_cu_data *per_cu;
20398 sect_offset offset;
20402 /* Hash function for a dwarf2_per_cu_offset_and_type. */
20405 per_cu_offset_and_type_hash (const void *item)
20407 const struct dwarf2_per_cu_offset_and_type *ofs = item;
20409 return (uintptr_t) ofs->per_cu + ofs->offset.sect_off;
20412 /* Equality function for a dwarf2_per_cu_offset_and_type. */
20415 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
20417 const struct dwarf2_per_cu_offset_and_type *ofs_lhs = item_lhs;
20418 const struct dwarf2_per_cu_offset_and_type *ofs_rhs = item_rhs;
20420 return (ofs_lhs->per_cu == ofs_rhs->per_cu
20421 && ofs_lhs->offset.sect_off == ofs_rhs->offset.sect_off);
20424 /* Set the type associated with DIE to TYPE. Save it in CU's hash
20425 table if necessary. For convenience, return TYPE.
20427 The DIEs reading must have careful ordering to:
20428 * Not cause infite loops trying to read in DIEs as a prerequisite for
20429 reading current DIE.
20430 * Not trying to dereference contents of still incompletely read in types
20431 while reading in other DIEs.
20432 * Enable referencing still incompletely read in types just by a pointer to
20433 the type without accessing its fields.
20435 Therefore caller should follow these rules:
20436 * Try to fetch any prerequisite types we may need to build this DIE type
20437 before building the type and calling set_die_type.
20438 * After building type call set_die_type for current DIE as soon as
20439 possible before fetching more types to complete the current type.
20440 * Make the type as complete as possible before fetching more types. */
20442 static struct type *
20443 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
20445 struct dwarf2_per_cu_offset_and_type **slot, ofs;
20446 struct objfile *objfile = cu->objfile;
20448 /* For Ada types, make sure that the gnat-specific data is always
20449 initialized (if not already set). There are a few types where
20450 we should not be doing so, because the type-specific area is
20451 already used to hold some other piece of info (eg: TYPE_CODE_FLT
20452 where the type-specific area is used to store the floatformat).
20453 But this is not a problem, because the gnat-specific information
20454 is actually not needed for these types. */
20455 if (need_gnat_info (cu)
20456 && TYPE_CODE (type) != TYPE_CODE_FUNC
20457 && TYPE_CODE (type) != TYPE_CODE_FLT
20458 && !HAVE_GNAT_AUX_INFO (type))
20459 INIT_GNAT_SPECIFIC (type);
20461 if (dwarf2_per_objfile->die_type_hash == NULL)
20463 dwarf2_per_objfile->die_type_hash =
20464 htab_create_alloc_ex (127,
20465 per_cu_offset_and_type_hash,
20466 per_cu_offset_and_type_eq,
20468 &objfile->objfile_obstack,
20469 hashtab_obstack_allocate,
20470 dummy_obstack_deallocate);
20473 ofs.per_cu = cu->per_cu;
20474 ofs.offset = die->offset;
20476 slot = (struct dwarf2_per_cu_offset_and_type **)
20477 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
20479 complaint (&symfile_complaints,
20480 _("A problem internal to GDB: DIE 0x%x has type already set"),
20481 die->offset.sect_off);
20482 *slot = obstack_alloc (&objfile->objfile_obstack, sizeof (**slot));
20487 /* Look up the type for the die at OFFSET in PER_CU in die_type_hash,
20488 or return NULL if the die does not have a saved type. */
20490 static struct type *
20491 get_die_type_at_offset (sect_offset offset,
20492 struct dwarf2_per_cu_data *per_cu)
20494 struct dwarf2_per_cu_offset_and_type *slot, ofs;
20496 if (dwarf2_per_objfile->die_type_hash == NULL)
20499 ofs.per_cu = per_cu;
20500 ofs.offset = offset;
20501 slot = htab_find (dwarf2_per_objfile->die_type_hash, &ofs);
20508 /* Look up the type for DIE in CU in die_type_hash,
20509 or return NULL if DIE does not have a saved type. */
20511 static struct type *
20512 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
20514 return get_die_type_at_offset (die->offset, cu->per_cu);
20517 /* Add a dependence relationship from CU to REF_PER_CU. */
20520 dwarf2_add_dependence (struct dwarf2_cu *cu,
20521 struct dwarf2_per_cu_data *ref_per_cu)
20525 if (cu->dependencies == NULL)
20527 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
20528 NULL, &cu->comp_unit_obstack,
20529 hashtab_obstack_allocate,
20530 dummy_obstack_deallocate);
20532 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
20534 *slot = ref_per_cu;
20537 /* Subroutine of dwarf2_mark to pass to htab_traverse.
20538 Set the mark field in every compilation unit in the
20539 cache that we must keep because we are keeping CU. */
20542 dwarf2_mark_helper (void **slot, void *data)
20544 struct dwarf2_per_cu_data *per_cu;
20546 per_cu = (struct dwarf2_per_cu_data *) *slot;
20548 /* cu->dependencies references may not yet have been ever read if QUIT aborts
20549 reading of the chain. As such dependencies remain valid it is not much
20550 useful to track and undo them during QUIT cleanups. */
20551 if (per_cu->cu == NULL)
20554 if (per_cu->cu->mark)
20556 per_cu->cu->mark = 1;
20558 if (per_cu->cu->dependencies != NULL)
20559 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
20564 /* Set the mark field in CU and in every other compilation unit in the
20565 cache that we must keep because we are keeping CU. */
20568 dwarf2_mark (struct dwarf2_cu *cu)
20573 if (cu->dependencies != NULL)
20574 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
20578 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
20582 per_cu->cu->mark = 0;
20583 per_cu = per_cu->cu->read_in_chain;
20587 /* Trivial hash function for partial_die_info: the hash value of a DIE
20588 is its offset in .debug_info for this objfile. */
20591 partial_die_hash (const void *item)
20593 const struct partial_die_info *part_die = item;
20595 return part_die->offset.sect_off;
20598 /* Trivial comparison function for partial_die_info structures: two DIEs
20599 are equal if they have the same offset. */
20602 partial_die_eq (const void *item_lhs, const void *item_rhs)
20604 const struct partial_die_info *part_die_lhs = item_lhs;
20605 const struct partial_die_info *part_die_rhs = item_rhs;
20607 return part_die_lhs->offset.sect_off == part_die_rhs->offset.sect_off;
20610 static struct cmd_list_element *set_dwarf2_cmdlist;
20611 static struct cmd_list_element *show_dwarf2_cmdlist;
20614 set_dwarf2_cmd (char *args, int from_tty)
20616 help_list (set_dwarf2_cmdlist, "maintenance set dwarf2 ", -1, gdb_stdout);
20620 show_dwarf2_cmd (char *args, int from_tty)
20622 cmd_show_list (show_dwarf2_cmdlist, from_tty, "");
20625 /* Free data associated with OBJFILE, if necessary. */
20628 dwarf2_per_objfile_free (struct objfile *objfile, void *d)
20630 struct dwarf2_per_objfile *data = d;
20633 /* Make sure we don't accidentally use dwarf2_per_objfile while
20635 dwarf2_per_objfile = NULL;
20637 for (ix = 0; ix < data->n_comp_units; ++ix)
20638 VEC_free (dwarf2_per_cu_ptr, data->all_comp_units[ix]->imported_symtabs);
20640 for (ix = 0; ix < data->n_type_units; ++ix)
20641 VEC_free (dwarf2_per_cu_ptr,
20642 data->all_type_units[ix]->per_cu.imported_symtabs);
20643 xfree (data->all_type_units);
20645 VEC_free (dwarf2_section_info_def, data->types);
20647 if (data->dwo_files)
20648 free_dwo_files (data->dwo_files, objfile);
20649 if (data->dwp_file)
20650 gdb_bfd_unref (data->dwp_file->dbfd);
20652 if (data->dwz_file && data->dwz_file->dwz_bfd)
20653 gdb_bfd_unref (data->dwz_file->dwz_bfd);
20657 /* The "save gdb-index" command. */
20659 /* The contents of the hash table we create when building the string
20661 struct strtab_entry
20663 offset_type offset;
20667 /* Hash function for a strtab_entry.
20669 Function is used only during write_hash_table so no index format backward
20670 compatibility is needed. */
20673 hash_strtab_entry (const void *e)
20675 const struct strtab_entry *entry = e;
20676 return mapped_index_string_hash (INT_MAX, entry->str);
20679 /* Equality function for a strtab_entry. */
20682 eq_strtab_entry (const void *a, const void *b)
20684 const struct strtab_entry *ea = a;
20685 const struct strtab_entry *eb = b;
20686 return !strcmp (ea->str, eb->str);
20689 /* Create a strtab_entry hash table. */
20692 create_strtab (void)
20694 return htab_create_alloc (100, hash_strtab_entry, eq_strtab_entry,
20695 xfree, xcalloc, xfree);
20698 /* Add a string to the constant pool. Return the string's offset in
20702 add_string (htab_t table, struct obstack *cpool, const char *str)
20705 struct strtab_entry entry;
20706 struct strtab_entry *result;
20709 slot = htab_find_slot (table, &entry, INSERT);
20714 result = XNEW (struct strtab_entry);
20715 result->offset = obstack_object_size (cpool);
20717 obstack_grow_str0 (cpool, str);
20720 return result->offset;
20723 /* An entry in the symbol table. */
20724 struct symtab_index_entry
20726 /* The name of the symbol. */
20728 /* The offset of the name in the constant pool. */
20729 offset_type index_offset;
20730 /* A sorted vector of the indices of all the CUs that hold an object
20732 VEC (offset_type) *cu_indices;
20735 /* The symbol table. This is a power-of-2-sized hash table. */
20736 struct mapped_symtab
20738 offset_type n_elements;
20740 struct symtab_index_entry **data;
20743 /* Hash function for a symtab_index_entry. */
20746 hash_symtab_entry (const void *e)
20748 const struct symtab_index_entry *entry = e;
20749 return iterative_hash (VEC_address (offset_type, entry->cu_indices),
20750 sizeof (offset_type) * VEC_length (offset_type,
20751 entry->cu_indices),
20755 /* Equality function for a symtab_index_entry. */
20758 eq_symtab_entry (const void *a, const void *b)
20760 const struct symtab_index_entry *ea = a;
20761 const struct symtab_index_entry *eb = b;
20762 int len = VEC_length (offset_type, ea->cu_indices);
20763 if (len != VEC_length (offset_type, eb->cu_indices))
20765 return !memcmp (VEC_address (offset_type, ea->cu_indices),
20766 VEC_address (offset_type, eb->cu_indices),
20767 sizeof (offset_type) * len);
20770 /* Destroy a symtab_index_entry. */
20773 delete_symtab_entry (void *p)
20775 struct symtab_index_entry *entry = p;
20776 VEC_free (offset_type, entry->cu_indices);
20780 /* Create a hash table holding symtab_index_entry objects. */
20783 create_symbol_hash_table (void)
20785 return htab_create_alloc (100, hash_symtab_entry, eq_symtab_entry,
20786 delete_symtab_entry, xcalloc, xfree);
20789 /* Create a new mapped symtab object. */
20791 static struct mapped_symtab *
20792 create_mapped_symtab (void)
20794 struct mapped_symtab *symtab = XNEW (struct mapped_symtab);
20795 symtab->n_elements = 0;
20796 symtab->size = 1024;
20797 symtab->data = XCNEWVEC (struct symtab_index_entry *, symtab->size);
20801 /* Destroy a mapped_symtab. */
20804 cleanup_mapped_symtab (void *p)
20806 struct mapped_symtab *symtab = p;
20807 /* The contents of the array are freed when the other hash table is
20809 xfree (symtab->data);
20813 /* Find a slot in SYMTAB for the symbol NAME. Returns a pointer to
20816 Function is used only during write_hash_table so no index format backward
20817 compatibility is needed. */
20819 static struct symtab_index_entry **
20820 find_slot (struct mapped_symtab *symtab, const char *name)
20822 offset_type index, step, hash = mapped_index_string_hash (INT_MAX, name);
20824 index = hash & (symtab->size - 1);
20825 step = ((hash * 17) & (symtab->size - 1)) | 1;
20829 if (!symtab->data[index] || !strcmp (name, symtab->data[index]->name))
20830 return &symtab->data[index];
20831 index = (index + step) & (symtab->size - 1);
20835 /* Expand SYMTAB's hash table. */
20838 hash_expand (struct mapped_symtab *symtab)
20840 offset_type old_size = symtab->size;
20842 struct symtab_index_entry **old_entries = symtab->data;
20845 symtab->data = XCNEWVEC (struct symtab_index_entry *, symtab->size);
20847 for (i = 0; i < old_size; ++i)
20849 if (old_entries[i])
20851 struct symtab_index_entry **slot = find_slot (symtab,
20852 old_entries[i]->name);
20853 *slot = old_entries[i];
20857 xfree (old_entries);
20860 /* Add an entry to SYMTAB. NAME is the name of the symbol.
20861 CU_INDEX is the index of the CU in which the symbol appears.
20862 IS_STATIC is one if the symbol is static, otherwise zero (global). */
20865 add_index_entry (struct mapped_symtab *symtab, const char *name,
20866 int is_static, gdb_index_symbol_kind kind,
20867 offset_type cu_index)
20869 struct symtab_index_entry **slot;
20870 offset_type cu_index_and_attrs;
20872 ++symtab->n_elements;
20873 if (4 * symtab->n_elements / 3 >= symtab->size)
20874 hash_expand (symtab);
20876 slot = find_slot (symtab, name);
20879 *slot = XNEW (struct symtab_index_entry);
20880 (*slot)->name = name;
20881 /* index_offset is set later. */
20882 (*slot)->cu_indices = NULL;
20885 cu_index_and_attrs = 0;
20886 DW2_GDB_INDEX_CU_SET_VALUE (cu_index_and_attrs, cu_index);
20887 DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE (cu_index_and_attrs, is_static);
20888 DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE (cu_index_and_attrs, kind);
20890 /* We don't want to record an index value twice as we want to avoid the
20892 We process all global symbols and then all static symbols
20893 (which would allow us to avoid the duplication by only having to check
20894 the last entry pushed), but a symbol could have multiple kinds in one CU.
20895 To keep things simple we don't worry about the duplication here and
20896 sort and uniqufy the list after we've processed all symbols. */
20897 VEC_safe_push (offset_type, (*slot)->cu_indices, cu_index_and_attrs);
20900 /* qsort helper routine for uniquify_cu_indices. */
20903 offset_type_compare (const void *ap, const void *bp)
20905 offset_type a = *(offset_type *) ap;
20906 offset_type b = *(offset_type *) bp;
20908 return (a > b) - (b > a);
20911 /* Sort and remove duplicates of all symbols' cu_indices lists. */
20914 uniquify_cu_indices (struct mapped_symtab *symtab)
20918 for (i = 0; i < symtab->size; ++i)
20920 struct symtab_index_entry *entry = symtab->data[i];
20923 && entry->cu_indices != NULL)
20925 unsigned int next_to_insert, next_to_check;
20926 offset_type last_value;
20928 qsort (VEC_address (offset_type, entry->cu_indices),
20929 VEC_length (offset_type, entry->cu_indices),
20930 sizeof (offset_type), offset_type_compare);
20932 last_value = VEC_index (offset_type, entry->cu_indices, 0);
20933 next_to_insert = 1;
20934 for (next_to_check = 1;
20935 next_to_check < VEC_length (offset_type, entry->cu_indices);
20938 if (VEC_index (offset_type, entry->cu_indices, next_to_check)
20941 last_value = VEC_index (offset_type, entry->cu_indices,
20943 VEC_replace (offset_type, entry->cu_indices, next_to_insert,
20948 VEC_truncate (offset_type, entry->cu_indices, next_to_insert);
20953 /* Add a vector of indices to the constant pool. */
20956 add_indices_to_cpool (htab_t symbol_hash_table, struct obstack *cpool,
20957 struct symtab_index_entry *entry)
20961 slot = htab_find_slot (symbol_hash_table, entry, INSERT);
20964 offset_type len = VEC_length (offset_type, entry->cu_indices);
20965 offset_type val = MAYBE_SWAP (len);
20970 entry->index_offset = obstack_object_size (cpool);
20972 obstack_grow (cpool, &val, sizeof (val));
20974 VEC_iterate (offset_type, entry->cu_indices, i, iter);
20977 val = MAYBE_SWAP (iter);
20978 obstack_grow (cpool, &val, sizeof (val));
20983 struct symtab_index_entry *old_entry = *slot;
20984 entry->index_offset = old_entry->index_offset;
20987 return entry->index_offset;
20990 /* Write the mapped hash table SYMTAB to the obstack OUTPUT, with
20991 constant pool entries going into the obstack CPOOL. */
20994 write_hash_table (struct mapped_symtab *symtab,
20995 struct obstack *output, struct obstack *cpool)
20998 htab_t symbol_hash_table;
21001 symbol_hash_table = create_symbol_hash_table ();
21002 str_table = create_strtab ();
21004 /* We add all the index vectors to the constant pool first, to
21005 ensure alignment is ok. */
21006 for (i = 0; i < symtab->size; ++i)
21008 if (symtab->data[i])
21009 add_indices_to_cpool (symbol_hash_table, cpool, symtab->data[i]);
21012 /* Now write out the hash table. */
21013 for (i = 0; i < symtab->size; ++i)
21015 offset_type str_off, vec_off;
21017 if (symtab->data[i])
21019 str_off = add_string (str_table, cpool, symtab->data[i]->name);
21020 vec_off = symtab->data[i]->index_offset;
21024 /* While 0 is a valid constant pool index, it is not valid
21025 to have 0 for both offsets. */
21030 str_off = MAYBE_SWAP (str_off);
21031 vec_off = MAYBE_SWAP (vec_off);
21033 obstack_grow (output, &str_off, sizeof (str_off));
21034 obstack_grow (output, &vec_off, sizeof (vec_off));
21037 htab_delete (str_table);
21038 htab_delete (symbol_hash_table);
21041 /* Struct to map psymtab to CU index in the index file. */
21042 struct psymtab_cu_index_map
21044 struct partial_symtab *psymtab;
21045 unsigned int cu_index;
21049 hash_psymtab_cu_index (const void *item)
21051 const struct psymtab_cu_index_map *map = item;
21053 return htab_hash_pointer (map->psymtab);
21057 eq_psymtab_cu_index (const void *item_lhs, const void *item_rhs)
21059 const struct psymtab_cu_index_map *lhs = item_lhs;
21060 const struct psymtab_cu_index_map *rhs = item_rhs;
21062 return lhs->psymtab == rhs->psymtab;
21065 /* Helper struct for building the address table. */
21066 struct addrmap_index_data
21068 struct objfile *objfile;
21069 struct obstack *addr_obstack;
21070 htab_t cu_index_htab;
21072 /* Non-zero if the previous_* fields are valid.
21073 We can't write an entry until we see the next entry (since it is only then
21074 that we know the end of the entry). */
21075 int previous_valid;
21076 /* Index of the CU in the table of all CUs in the index file. */
21077 unsigned int previous_cu_index;
21078 /* Start address of the CU. */
21079 CORE_ADDR previous_cu_start;
21082 /* Write an address entry to OBSTACK. */
21085 add_address_entry (struct objfile *objfile, struct obstack *obstack,
21086 CORE_ADDR start, CORE_ADDR end, unsigned int cu_index)
21088 offset_type cu_index_to_write;
21090 CORE_ADDR baseaddr;
21092 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
21094 store_unsigned_integer (addr, 8, BFD_ENDIAN_LITTLE, start - baseaddr);
21095 obstack_grow (obstack, addr, 8);
21096 store_unsigned_integer (addr, 8, BFD_ENDIAN_LITTLE, end - baseaddr);
21097 obstack_grow (obstack, addr, 8);
21098 cu_index_to_write = MAYBE_SWAP (cu_index);
21099 obstack_grow (obstack, &cu_index_to_write, sizeof (offset_type));
21102 /* Worker function for traversing an addrmap to build the address table. */
21105 add_address_entry_worker (void *datap, CORE_ADDR start_addr, void *obj)
21107 struct addrmap_index_data *data = datap;
21108 struct partial_symtab *pst = obj;
21110 if (data->previous_valid)
21111 add_address_entry (data->objfile, data->addr_obstack,
21112 data->previous_cu_start, start_addr,
21113 data->previous_cu_index);
21115 data->previous_cu_start = start_addr;
21118 struct psymtab_cu_index_map find_map, *map;
21119 find_map.psymtab = pst;
21120 map = htab_find (data->cu_index_htab, &find_map);
21121 gdb_assert (map != NULL);
21122 data->previous_cu_index = map->cu_index;
21123 data->previous_valid = 1;
21126 data->previous_valid = 0;
21131 /* Write OBJFILE's address map to OBSTACK.
21132 CU_INDEX_HTAB is used to map addrmap entries to their CU indices
21133 in the index file. */
21136 write_address_map (struct objfile *objfile, struct obstack *obstack,
21137 htab_t cu_index_htab)
21139 struct addrmap_index_data addrmap_index_data;
21141 /* When writing the address table, we have to cope with the fact that
21142 the addrmap iterator only provides the start of a region; we have to
21143 wait until the next invocation to get the start of the next region. */
21145 addrmap_index_data.objfile = objfile;
21146 addrmap_index_data.addr_obstack = obstack;
21147 addrmap_index_data.cu_index_htab = cu_index_htab;
21148 addrmap_index_data.previous_valid = 0;
21150 addrmap_foreach (objfile->psymtabs_addrmap, add_address_entry_worker,
21151 &addrmap_index_data);
21153 /* It's highly unlikely the last entry (end address = 0xff...ff)
21154 is valid, but we should still handle it.
21155 The end address is recorded as the start of the next region, but that
21156 doesn't work here. To cope we pass 0xff...ff, this is a rare situation
21158 if (addrmap_index_data.previous_valid)
21159 add_address_entry (objfile, obstack,
21160 addrmap_index_data.previous_cu_start, (CORE_ADDR) -1,
21161 addrmap_index_data.previous_cu_index);
21164 /* Return the symbol kind of PSYM. */
21166 static gdb_index_symbol_kind
21167 symbol_kind (struct partial_symbol *psym)
21169 domain_enum domain = PSYMBOL_DOMAIN (psym);
21170 enum address_class aclass = PSYMBOL_CLASS (psym);
21178 return GDB_INDEX_SYMBOL_KIND_FUNCTION;
21180 return GDB_INDEX_SYMBOL_KIND_TYPE;
21182 case LOC_CONST_BYTES:
21183 case LOC_OPTIMIZED_OUT:
21185 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
21187 /* Note: It's currently impossible to recognize psyms as enum values
21188 short of reading the type info. For now punt. */
21189 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
21191 /* There are other LOC_FOO values that one might want to classify
21192 as variables, but dwarf2read.c doesn't currently use them. */
21193 return GDB_INDEX_SYMBOL_KIND_OTHER;
21195 case STRUCT_DOMAIN:
21196 return GDB_INDEX_SYMBOL_KIND_TYPE;
21198 return GDB_INDEX_SYMBOL_KIND_OTHER;
21202 /* Add a list of partial symbols to SYMTAB. */
21205 write_psymbols (struct mapped_symtab *symtab,
21207 struct partial_symbol **psymp,
21209 offset_type cu_index,
21212 for (; count-- > 0; ++psymp)
21214 struct partial_symbol *psym = *psymp;
21217 if (SYMBOL_LANGUAGE (psym) == language_ada)
21218 error (_("Ada is not currently supported by the index"));
21220 /* Only add a given psymbol once. */
21221 slot = htab_find_slot (psyms_seen, psym, INSERT);
21224 gdb_index_symbol_kind kind = symbol_kind (psym);
21227 add_index_entry (symtab, SYMBOL_SEARCH_NAME (psym),
21228 is_static, kind, cu_index);
21233 /* Write the contents of an ("unfinished") obstack to FILE. Throw an
21234 exception if there is an error. */
21237 write_obstack (FILE *file, struct obstack *obstack)
21239 if (fwrite (obstack_base (obstack), 1, obstack_object_size (obstack),
21241 != obstack_object_size (obstack))
21242 error (_("couldn't data write to file"));
21245 /* Unlink a file if the argument is not NULL. */
21248 unlink_if_set (void *p)
21250 char **filename = p;
21252 unlink (*filename);
21255 /* A helper struct used when iterating over debug_types. */
21256 struct signatured_type_index_data
21258 struct objfile *objfile;
21259 struct mapped_symtab *symtab;
21260 struct obstack *types_list;
21265 /* A helper function that writes a single signatured_type to an
21269 write_one_signatured_type (void **slot, void *d)
21271 struct signatured_type_index_data *info = d;
21272 struct signatured_type *entry = (struct signatured_type *) *slot;
21273 struct partial_symtab *psymtab = entry->per_cu.v.psymtab;
21276 write_psymbols (info->symtab,
21278 info->objfile->global_psymbols.list
21279 + psymtab->globals_offset,
21280 psymtab->n_global_syms, info->cu_index,
21282 write_psymbols (info->symtab,
21284 info->objfile->static_psymbols.list
21285 + psymtab->statics_offset,
21286 psymtab->n_static_syms, info->cu_index,
21289 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
21290 entry->per_cu.offset.sect_off);
21291 obstack_grow (info->types_list, val, 8);
21292 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
21293 entry->type_offset_in_tu.cu_off);
21294 obstack_grow (info->types_list, val, 8);
21295 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, entry->signature);
21296 obstack_grow (info->types_list, val, 8);
21303 /* Recurse into all "included" dependencies and write their symbols as
21304 if they appeared in this psymtab. */
21307 recursively_write_psymbols (struct objfile *objfile,
21308 struct partial_symtab *psymtab,
21309 struct mapped_symtab *symtab,
21311 offset_type cu_index)
21315 for (i = 0; i < psymtab->number_of_dependencies; ++i)
21316 if (psymtab->dependencies[i]->user != NULL)
21317 recursively_write_psymbols (objfile, psymtab->dependencies[i],
21318 symtab, psyms_seen, cu_index);
21320 write_psymbols (symtab,
21322 objfile->global_psymbols.list + psymtab->globals_offset,
21323 psymtab->n_global_syms, cu_index,
21325 write_psymbols (symtab,
21327 objfile->static_psymbols.list + psymtab->statics_offset,
21328 psymtab->n_static_syms, cu_index,
21332 /* Create an index file for OBJFILE in the directory DIR. */
21335 write_psymtabs_to_index (struct objfile *objfile, const char *dir)
21337 struct cleanup *cleanup;
21338 char *filename, *cleanup_filename;
21339 struct obstack contents, addr_obstack, constant_pool, symtab_obstack;
21340 struct obstack cu_list, types_cu_list;
21343 struct mapped_symtab *symtab;
21344 offset_type val, size_of_contents, total_len;
21347 htab_t cu_index_htab;
21348 struct psymtab_cu_index_map *psymtab_cu_index_map;
21350 if (dwarf2_per_objfile->using_index)
21351 error (_("Cannot use an index to create the index"));
21353 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) > 1)
21354 error (_("Cannot make an index when the file has multiple .debug_types sections"));
21356 if (!objfile->psymtabs || !objfile->psymtabs_addrmap)
21359 if (stat (objfile_name (objfile), &st) < 0)
21360 perror_with_name (objfile_name (objfile));
21362 filename = concat (dir, SLASH_STRING, lbasename (objfile_name (objfile)),
21363 INDEX_SUFFIX, (char *) NULL);
21364 cleanup = make_cleanup (xfree, filename);
21366 out_file = gdb_fopen_cloexec (filename, "wb");
21368 error (_("Can't open `%s' for writing"), filename);
21370 cleanup_filename = filename;
21371 make_cleanup (unlink_if_set, &cleanup_filename);
21373 symtab = create_mapped_symtab ();
21374 make_cleanup (cleanup_mapped_symtab, symtab);
21376 obstack_init (&addr_obstack);
21377 make_cleanup_obstack_free (&addr_obstack);
21379 obstack_init (&cu_list);
21380 make_cleanup_obstack_free (&cu_list);
21382 obstack_init (&types_cu_list);
21383 make_cleanup_obstack_free (&types_cu_list);
21385 psyms_seen = htab_create_alloc (100, htab_hash_pointer, htab_eq_pointer,
21386 NULL, xcalloc, xfree);
21387 make_cleanup_htab_delete (psyms_seen);
21389 /* While we're scanning CU's create a table that maps a psymtab pointer
21390 (which is what addrmap records) to its index (which is what is recorded
21391 in the index file). This will later be needed to write the address
21393 cu_index_htab = htab_create_alloc (100,
21394 hash_psymtab_cu_index,
21395 eq_psymtab_cu_index,
21396 NULL, xcalloc, xfree);
21397 make_cleanup_htab_delete (cu_index_htab);
21398 psymtab_cu_index_map = (struct psymtab_cu_index_map *)
21399 xmalloc (sizeof (struct psymtab_cu_index_map)
21400 * dwarf2_per_objfile->n_comp_units);
21401 make_cleanup (xfree, psymtab_cu_index_map);
21403 /* The CU list is already sorted, so we don't need to do additional
21404 work here. Also, the debug_types entries do not appear in
21405 all_comp_units, but only in their own hash table. */
21406 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
21408 struct dwarf2_per_cu_data *per_cu
21409 = dwarf2_per_objfile->all_comp_units[i];
21410 struct partial_symtab *psymtab = per_cu->v.psymtab;
21412 struct psymtab_cu_index_map *map;
21415 /* CU of a shared file from 'dwz -m' may be unused by this main file.
21416 It may be referenced from a local scope but in such case it does not
21417 need to be present in .gdb_index. */
21418 if (psymtab == NULL)
21421 if (psymtab->user == NULL)
21422 recursively_write_psymbols (objfile, psymtab, symtab, psyms_seen, i);
21424 map = &psymtab_cu_index_map[i];
21425 map->psymtab = psymtab;
21427 slot = htab_find_slot (cu_index_htab, map, INSERT);
21428 gdb_assert (slot != NULL);
21429 gdb_assert (*slot == NULL);
21432 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE,
21433 per_cu->offset.sect_off);
21434 obstack_grow (&cu_list, val, 8);
21435 store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, per_cu->length);
21436 obstack_grow (&cu_list, val, 8);
21439 /* Dump the address map. */
21440 write_address_map (objfile, &addr_obstack, cu_index_htab);
21442 /* Write out the .debug_type entries, if any. */
21443 if (dwarf2_per_objfile->signatured_types)
21445 struct signatured_type_index_data sig_data;
21447 sig_data.objfile = objfile;
21448 sig_data.symtab = symtab;
21449 sig_data.types_list = &types_cu_list;
21450 sig_data.psyms_seen = psyms_seen;
21451 sig_data.cu_index = dwarf2_per_objfile->n_comp_units;
21452 htab_traverse_noresize (dwarf2_per_objfile->signatured_types,
21453 write_one_signatured_type, &sig_data);
21456 /* Now that we've processed all symbols we can shrink their cu_indices
21458 uniquify_cu_indices (symtab);
21460 obstack_init (&constant_pool);
21461 make_cleanup_obstack_free (&constant_pool);
21462 obstack_init (&symtab_obstack);
21463 make_cleanup_obstack_free (&symtab_obstack);
21464 write_hash_table (symtab, &symtab_obstack, &constant_pool);
21466 obstack_init (&contents);
21467 make_cleanup_obstack_free (&contents);
21468 size_of_contents = 6 * sizeof (offset_type);
21469 total_len = size_of_contents;
21471 /* The version number. */
21472 val = MAYBE_SWAP (8);
21473 obstack_grow (&contents, &val, sizeof (val));
21475 /* The offset of the CU list from the start of the file. */
21476 val = MAYBE_SWAP (total_len);
21477 obstack_grow (&contents, &val, sizeof (val));
21478 total_len += obstack_object_size (&cu_list);
21480 /* The offset of the types CU list from the start of the file. */
21481 val = MAYBE_SWAP (total_len);
21482 obstack_grow (&contents, &val, sizeof (val));
21483 total_len += obstack_object_size (&types_cu_list);
21485 /* The offset of the address table from the start of the file. */
21486 val = MAYBE_SWAP (total_len);
21487 obstack_grow (&contents, &val, sizeof (val));
21488 total_len += obstack_object_size (&addr_obstack);
21490 /* The offset of the symbol table from the start of the file. */
21491 val = MAYBE_SWAP (total_len);
21492 obstack_grow (&contents, &val, sizeof (val));
21493 total_len += obstack_object_size (&symtab_obstack);
21495 /* The offset of the constant pool from the start of the file. */
21496 val = MAYBE_SWAP (total_len);
21497 obstack_grow (&contents, &val, sizeof (val));
21498 total_len += obstack_object_size (&constant_pool);
21500 gdb_assert (obstack_object_size (&contents) == size_of_contents);
21502 write_obstack (out_file, &contents);
21503 write_obstack (out_file, &cu_list);
21504 write_obstack (out_file, &types_cu_list);
21505 write_obstack (out_file, &addr_obstack);
21506 write_obstack (out_file, &symtab_obstack);
21507 write_obstack (out_file, &constant_pool);
21511 /* We want to keep the file, so we set cleanup_filename to NULL
21512 here. See unlink_if_set. */
21513 cleanup_filename = NULL;
21515 do_cleanups (cleanup);
21518 /* Implementation of the `save gdb-index' command.
21520 Note that the file format used by this command is documented in the
21521 GDB manual. Any changes here must be documented there. */
21524 save_gdb_index_command (char *arg, int from_tty)
21526 struct objfile *objfile;
21529 error (_("usage: save gdb-index DIRECTORY"));
21531 ALL_OBJFILES (objfile)
21535 /* If the objfile does not correspond to an actual file, skip it. */
21536 if (stat (objfile_name (objfile), &st) < 0)
21539 dwarf2_per_objfile = objfile_data (objfile, dwarf2_objfile_data_key);
21540 if (dwarf2_per_objfile)
21542 volatile struct gdb_exception except;
21544 TRY_CATCH (except, RETURN_MASK_ERROR)
21546 write_psymtabs_to_index (objfile, arg);
21548 if (except.reason < 0)
21549 exception_fprintf (gdb_stderr, except,
21550 _("Error while writing index for `%s': "),
21551 objfile_name (objfile));
21558 int dwarf2_always_disassemble;
21561 show_dwarf2_always_disassemble (struct ui_file *file, int from_tty,
21562 struct cmd_list_element *c, const char *value)
21564 fprintf_filtered (file,
21565 _("Whether to always disassemble "
21566 "DWARF expressions is %s.\n"),
21571 show_check_physname (struct ui_file *file, int from_tty,
21572 struct cmd_list_element *c, const char *value)
21574 fprintf_filtered (file,
21575 _("Whether to check \"physname\" is %s.\n"),
21579 void _initialize_dwarf2_read (void);
21582 _initialize_dwarf2_read (void)
21584 struct cmd_list_element *c;
21586 dwarf2_objfile_data_key
21587 = register_objfile_data_with_cleanup (NULL, dwarf2_per_objfile_free);
21589 add_prefix_cmd ("dwarf2", class_maintenance, set_dwarf2_cmd, _("\
21590 Set DWARF 2 specific variables.\n\
21591 Configure DWARF 2 variables such as the cache size"),
21592 &set_dwarf2_cmdlist, "maintenance set dwarf2 ",
21593 0/*allow-unknown*/, &maintenance_set_cmdlist);
21595 add_prefix_cmd ("dwarf2", class_maintenance, show_dwarf2_cmd, _("\
21596 Show DWARF 2 specific variables\n\
21597 Show DWARF 2 variables such as the cache size"),
21598 &show_dwarf2_cmdlist, "maintenance show dwarf2 ",
21599 0/*allow-unknown*/, &maintenance_show_cmdlist);
21601 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
21602 &dwarf2_max_cache_age, _("\
21603 Set the upper bound on the age of cached dwarf2 compilation units."), _("\
21604 Show the upper bound on the age of cached dwarf2 compilation units."), _("\
21605 A higher limit means that cached compilation units will be stored\n\
21606 in memory longer, and more total memory will be used. Zero disables\n\
21607 caching, which can slow down startup."),
21609 show_dwarf2_max_cache_age,
21610 &set_dwarf2_cmdlist,
21611 &show_dwarf2_cmdlist);
21613 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
21614 &dwarf2_always_disassemble, _("\
21615 Set whether `info address' always disassembles DWARF expressions."), _("\
21616 Show whether `info address' always disassembles DWARF expressions."), _("\
21617 When enabled, DWARF expressions are always printed in an assembly-like\n\
21618 syntax. When disabled, expressions will be printed in a more\n\
21619 conversational style, when possible."),
21621 show_dwarf2_always_disassemble,
21622 &set_dwarf2_cmdlist,
21623 &show_dwarf2_cmdlist);
21625 add_setshow_boolean_cmd ("dwarf2-read", no_class, &dwarf2_read_debug, _("\
21626 Set debugging of the dwarf2 reader."), _("\
21627 Show debugging of the dwarf2 reader."), _("\
21628 When enabled, debugging messages are printed during dwarf2 reading\n\
21629 and symtab expansion."),
21632 &setdebuglist, &showdebuglist);
21634 add_setshow_zuinteger_cmd ("dwarf2-die", no_class, &dwarf2_die_debug, _("\
21635 Set debugging of the dwarf2 DIE reader."), _("\
21636 Show debugging of the dwarf2 DIE reader."), _("\
21637 When enabled (non-zero), DIEs are dumped after they are read in.\n\
21638 The value is the maximum depth to print."),
21641 &setdebuglist, &showdebuglist);
21643 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
21644 Set cross-checking of \"physname\" code against demangler."), _("\
21645 Show cross-checking of \"physname\" code against demangler."), _("\
21646 When enabled, GDB's internal \"physname\" code is checked against\n\
21648 NULL, show_check_physname,
21649 &setdebuglist, &showdebuglist);
21651 add_setshow_boolean_cmd ("use-deprecated-index-sections",
21652 no_class, &use_deprecated_index_sections, _("\
21653 Set whether to use deprecated gdb_index sections."), _("\
21654 Show whether to use deprecated gdb_index sections."), _("\
21655 When enabled, deprecated .gdb_index sections are used anyway.\n\
21656 Normally they are ignored either because of a missing feature or\n\
21657 performance issue.\n\
21658 Warning: This option must be enabled before gdb reads the file."),
21661 &setlist, &showlist);
21663 c = add_cmd ("gdb-index", class_files, save_gdb_index_command,
21665 Save a gdb-index file.\n\
21666 Usage: save gdb-index DIRECTORY"),
21668 set_cmd_completer (c, filename_completer);
21670 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
21671 &dwarf2_locexpr_funcs);
21672 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
21673 &dwarf2_loclist_funcs);
21675 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
21676 &dwarf2_block_frame_base_locexpr_funcs);
21677 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
21678 &dwarf2_block_frame_base_loclist_funcs);